US1900805A - Metal edged gypsum lumber - Google Patents

Description

March 7, c D 5 DGED GYPSUM LUMBER Original Filed Sept. 15, 1932 2 Sheets-Sheet 1 INVENT OR.

ATTORNEY.

March 7, 1933. c DAVls 1,900,805

METAL EDGED GYPSUM LUMBER Original Filed Sept. 13, 1932 2 Sheets-Sheet 2 INVENT OR.

ATTORNEY.

Patented Mar. 7, 1933 v UNITED STATES PATENT OFFICE CLARKE F. DAVIE, OF BHOBT HILLS, NEW JERSEY KETAL EDGED GYPSUM LUMBER Original application flied September 13, 1882, Serial No. 632,809. Divided and this application filed December 10, 1932. Serial No. 847,971,

The present invention relates to a building unit of set cementitions material having on at least one of its edge portions 8. metallic element adapted to engage a complementary metallic element on an adjacent unit in a mating or interlocking joint.

Building constructions of today include many types of materials for floor and roof decks, partitions, walls, ceilings and the like, but as far as I am aware, no type of construction has been designed which can equal wood in cheapness of initial cost. flexibility of application and ease of erection. The use of wood, however, in many situations is objectionable from various standpoints, the principal one being that it is readily combustible and involves, therefore, a fire hazard which makes its use. prohibitive in many circumstances. Another objectionable feature of wood is that unit for unit it does not have the strm-tural strength of metal and as a, result, if requisite strength is to he secured, such elements being of wood must be of such size aml weight as to be prohibitive in cost and ditlieult to handle which, of course, adds materially to the cost of erection. Moreover, wood is subject to deterioration. All of the above necessarily classifies wood as an undesirable building material when viewed from these aspects, although it does have many desirable characteristics, as above outlined.

The principal object of this invention, therefore, is to design a building unit which may be handled in the same manner as wood planks or beams, which is fire-proof or semifireproof, which is not subject to deterioration, and which through properly designed units may be made to sustain loads and stresses and span distances between supporting elements far reater than anything possible with a wood construction of the same dimensions.

Other advantages and objects will be apparent as the description proceeds.

To this end the invention contemplates what may be termed a precast lank or slab having a body of set cementitlous material preferably of gypsum or the like, having a metallic member or members attached to or embedded in one or more edges thereof to either partially or fully enclose said edge or edges, the metallic element or elements, or other ed e members being adapted to engage or interlbck with a corresponding or complementary edge. member on an adjacent slab or plank. It is contemplated by this invention that either the greater part or the whole of the load which this plank is ca :1- ble of sustaining will be borne by the edge member rather than the comparatively weak eement-itious body.

It is contemplated that the slab or plank of this invention as above set forth ma be made in any dimension with the meta or edge member of any desired weight or thickness, the design of which, however, will be determined by the particular roblem in hand. Such planks may be use as sustaining or partition walls, roofs, ceilings, floors, or metal surfaces or in fact any situation where wood may be used and many, situations where wood could not be used.

If found desirable, a metallic or stren hening edge member may exist at all our edges in order to give strength in two directions or may be only used on opposite edges or on one edge where the other ed is not designed to sustain a load. Such p anks or units may have necessary reinforcements therein where it is found desirable to have the main body thereof of suflicient strength to carry a portion of the load and where the lateral width of the cementitious bod of gypsum or the like is such that its 109. sustaining value does not fall within the desired factor of safety. may consist of rods, mesh, structural sha .s and in fact any type of integral construction which will lend load sustaining strength to an otherwise weak body not capable of sustaining the load without such re nforcement.

As desi ned, the weight or gauge of the edge memiers necessary to sustain all norfuel loads which may be experienced in building constructions will be found to be light enough to be sawed by a saw of the hack type. This lends flexibility to the applicat onof the units as they may be sawed to fit any particular location or circumstance.

This reinforcement er of the I beam t pe, channels, bar joists,

wood framing or w at not, can be calculated not from the standpoint of the load sustaining value of the cementitious body, but on the contrary, from the load sustaining value of the engaged or interlocked members. This will be apparent when it is recognized that in the preferred form of the invention adjacent interlocked metal members on two.

contiguous slabs form in efiect an I beam. In some instances this eflective I beam may have a multiple thickness uninterru ted vertical web with multiple thickness anges at each end thereof overlapping each other. Thus while the individual metal member may be made of comparatively light gauge material yet when adjacent members are interlocked together in the building construction, the effective strength of the resultant I beam is many times the strength of the individual sections.

I have found that where these slabs or planks are supported as in a floor, roof or the like, upon supporting elements, due to the construction of this plank, the ratio of supporting element spacing to slab thickness need not be less than 24 :1. When it is remembered that in wood constructions this ratio cannot be greater than 18 or 20:1, but on the contrary is usually from 12 to 15:1, the advantage of such a construction will be apparent.

Where gypsum either neat or with an admixture of fiber such as vegetable matter, of which wood chips is typical, or even where mineral fibers such as asbestos or the like are used, the ratio of supporting element spacing to slab thickness is evenless than that with wood. This is due'to the inherent weakness of gypsum alone. This means that an unedged gypsum slab if a spacin fifteen or eighteen times the thickness 0 the slab is to be used, the slab thickness must be such as to be expensive both from the standpoint of initial material and necessary reinforcement, and is extremely diificult to handle due to this excessive weight.

Slabs constructed according to the resent invention are substantially fireproo and have high insulating value both as to heat and sound. In some forms the metallic ed e members may extend over the face of the slab body or they may be embedded therein and not expose T e latter is preferable from the standpoint of greater fire roofing qualities because in such instances e metal itself is not exposed to the heat of the fire,

but on the contrary, the intervening thickness of gypsum or other cementitious material serves to protect the metal from the ravages thereof.

The planks or lumber constructed according to the present invention form an ideal surface for interior or exterior decoration, as it will make a strong bond with any of the accepted plasters such as lime, gypsum, magnesium oxychloride or oxysulphate cements, plastic paints, oil or cold water paints and paper or cloth decorated surfaces applied thereto either by means of paint-like substances, size or glue.

Gypsum itself, which is an ideal material for the plank body, will not ordinarily hold nails permanently without loosening, and if such nails are driven near the unprotected edges, the gypsum has a tendency to crack or spall. This tendency, however, is materially decreased where a fibrous filler such as wood chips or the like is used. With the planks of this invention, however, where the edges contain a strengthening or protecting element, such as metal, when the nails are driven through this protecting element, and the invention contemplates in all cases that such material shall be of a gauge suflicient to permit driving of nails therethrough, it is practically impossible to loosen the same, due to the fact that the nail is not only gripped by the cementitious body, but is gripped by the metal or protecting element through which the nail penetrates, and this metal or protecting element co-operates with the gypsum body to prevent any loosening effect which may later occur.

The invention further consists in the novel arrangement, combination and construction of parts hereinafter more fully described and shown in the accompanying drawing.

In the drawings Fig. 1 is a fragmentary perspective view of contiguous slabs showing one form of mating joint.

Fig. 2 is a sectional view of the Fi 1 when joined.

ig. 3 is an end form of joint.

Fig. 4 is an form of joint.

Fig. 5 is an form of joint.

Fig. 6 is an form of joint.

Fig. 7 is an form of joint.

Fig. 8 is an form of joint.

In Fig. 1 the body of a slab A is shown at 1 of a suitable cementitious material of which sum is a This material may contain t e usual fi are such as fibers, wood chips or the like. While gypsum has been slabs of view showing another end view showing another end view showing another end view showing another end view showing another end view showing another found to be an advantageous material because of its lightness, yet where greater strength is desired in the slab body itself and weight is of no consideration, this body may1 obviously be made of other materials suc as concrete, magnesium oxychloride or sul hate'cements or the like.

s shown, at least one edge of each slab is provided with a metal element designated enerally at 2, this metal element embracing t e edge of the body 1 and having its ends folded back upon itself to form a top flange 3 and a bottom flange 4 with a central vertical web 5. The flanges 3 and 4 in the 'folding over 0 eration should preferably be provided wit order to accommodate the portions 7 of the corresponding flanges on the com lenientar edge member carried by the contiguous slab In orderto prevent either during shipment manipulation orotherwise, these edge members from pulling away from the body 1 of the slabs, ears 8 are provided punched out of the material, in this case from the lower flanges d, and in the pouring operation become embedded in the slab bod As a result, it is not possible to acci entally displace these edge members from the slab.

When the two slabs are assembled on the job either as a wall, floor, ceiling, roof or the like they assume the form shown in Fig.

with the complementary or corresponding member on the adjacent slab that a substantlal I beam construction results. It is to be noted from an inspection of Fig. 2 that a particularlysturdy construction occurs due to this joining interlock, not only by reason of the fact that an I beam is formed, but also bg reason of the overlapping arrangement of t e two metal members to form a triple thickness of flanges at the top and bottom joined by a double thickness uninterrupted vertical web.

As a result of this type of construction, it will be apparent that the load sustaining value of a floor or roof deck formed therefrom is traceable directly back to the load sustaining value of the interlocking edge members rather than being dependent u on the strength of the body 1. ThlS body 1 oes serve the purpose of lending lateral stifiness to the construction and hence prevents buckling or bending of the I beam edges under strain. For this reason the ratio of supporting element spacing to slab thickness may be as great as 24 :1 and greater, whereas 111 wood constructions this ratio is many times as low as 12:1.

One of the advantages in the present construction resides in the fact that these units may be made in any lengths as long as the total weight of the unit is kept within a range where one or two men can handle it.

slight spaces 6 therebetween in latter element is which then becomes a derrick type of job.

In such instances, these dimensions may be atly exceeded, being limited only to the initial cost of the construction and its resultant erection expense.

The load sustaining value of any unit will be dependent, of course, u on the ange of metal used to form the e ge mem rs and the ange used therein will in turn be depen ent upon the necessary initial expense plus the cost of formation. For economical use I have found that cold rolled steel is admirably adapted for most constructional purposes, althou h in larger sections cast shapes will proba ly have to be resorted to.

In Fig. 3 the metal member attached to the slab A has its ends turned back upon itself to form a double thickness flange 9, at the top thereof, a single thickness of this flange projecting beyond the edge of the slab A and terminating in a V 10, which as shown fits into a corres onding V 11 of the metal member attache to slab B. This rovided with angular bends 12 embedded in the body 1 of the slab B to prevent the same from accidentally separating therefrom. Obviously the metal element attached to the slab A may be bent likewise or either or both of the flanges provided with ears 8 as shown in Figs. 1 and 2 for the same urpose. The extreme end of the bottom ange 9 underlies the bottom flange of the metal element on the slab B as at 13 when the two slabs are placed in interlocking relationship. This type of construction corresponds to the I beam principle of Fig. 2. It will be a parent that as the slabs A and B are force together, the metal element on the former snaps into engagement with the latter, the spring portion 10 locking with the corres onding groove 11 and serves to revent un ue separation of the parts. This of course, is in addition to whatever frictional contact may be made in this practically tongued and grooved joint.

Fi 4 shows a t pe of joint in which the meta member on the slab A has a top flange constituting a double thickness due to the material being reversed u on itself, and also being provided with a rig t angular bend 14 to prevent undue separation of the metal from the slab. The end 10a of the top slab A is slightly modified from the showing of Fig. 3 but likewise seats in a corresponding roove 11a on the metal element of slab B.

he lower flanged portion of the metal element on the slab B is of double thickness, shown at 15, which is receivable into a groove 16 formed by a doubling back upon itself of the lower rtion of'the metal of the element attache to the slab A so as to secure an interlock at this point. A tip 17 ma be turned up on the metal element 0 the sla A to become embedded in the material and prevent separation of the parts. As shown, not only is there a snap interlock between the two metal elements at the top in much the same manner as Fig. 3, but there is a definite interlock at the bottom in the same manner as Fig. 2. This makes for a sturdy construction.

Fig. 5 shows a construction in which the top portion is very similar to that of Fig. 3 except that the spring portion 18 is in the form of a surface of revolution which fits into a corresponding groove or recess 19 in the metal element attached to the slab B. In many instances it will be found unnecessary to interlock the two metal elements at the bottom at all by reason of the above interlock and for this reason no mating joint has been shown at the bottom of this form of construction. a

In Fig. 6 the metal element attached to slab A is shown to be provided with a double thickness flange 20, pro'ectin beyond the ed e of the slab, the on of w ich is materia ly deformed into a surface of revolution 21, with a projecting end 22 at an angle thereto. The deformed portion 21 likewise fits the corres onding groove 23 in the element attache to slab B so as to form a spring fit therewith. The angular end 22 serves to additionally strengthen the flange 20. In the case 'of either or both of the metal elements it may be found desirable to turn up the extreme ends as at 12 to embed the same in the body of the slab to revent separation of these parts although t is may be omitted where desired.

In any of the constructions shown in Figs. 3, 4, 5 and 6 this spring engagement between the ends of a flange and the overlaid portion of the contiguous metal element on the other slab may be a continuous oove or it may be constituted by a series 0 separated depressions to serve this same purpose.

In Fig. 7 a form of tongue is shown to consist of the metal of the element attached to slab B folded back upon itself at the bottom and brought up alongside of the web and then deformed into a 8 ring tongue 24. The element attached to sla A is rovidcd with a groove 25 of substantially shape. It is contemplated that the tongue 24 shall be opened normall and before assembly to a point where it Wlll not quite fit within the groove 25. When the two slabs are then forced together, this spring tongue 24 is caused to slightly collapse, which thereby increases the frictional engagement between the metal surrounding the groove 25 and insures a positive interlock between the parts. It is to be noted in this construction that an handlin efiective I beam results, which I beam includes the multiple thickness vertical web,

one of said thicknesses being uninterrupted and in) multiple thickness flange at the end 0 a we In Fig.8 the edge of the slab A is slightly lessened in thickness and completely covered by the metal element 26 w ich forms in e set a ton us in itself. The element attached to s ab B is doubled back upon itself at the top and bottom to form double thicknesses of metal at 27, and these portions extend outwardly from the slab B and overlie and frictionally engage the metal member attached to slab A to orm a rigid and tight interlock. As shown, the ends of the metal elements are. turned into the body of the slabs A and B to prevent accidental dis lacement of such protecting elements uring It is also to be noted that due to the slig tly reduced height of the ton e protected by the metal element 26, the b ies of the slabs with their edge members are substantiall flush and included within a single plane. his is desirable particularly from the stand int of a wall, ceiling or the like where a nish of plastic paint or the like is a plied directly to the surface of such slabs.

he absence of depressions insures a smooth and unbroken surface.

Obviously the slabs of this invention may be used as sustaining walls, partition walls, roof decks, floors, ceilings or in fact in any position, vertical horizontal or any angle therebetween, and tied to, laid upon or hung from any desirable type of support. It will be obvious from the foregoing description that by making the metal e ement of suitable auge, the slabs may be sawed in any desired engths to fit the particular circumstances of erection, and applied in exactly the same manner as wood planks or lumber. It is contem lated that due to the extreme lengths in whic this material may be made by reason of the fact that the load sustaining portion thereof is the metal element, one slab may span any distance up to its length without regard to support spacing or the occurrence of joints that is, a joint need not necessarily occur directly over under or coincide with the support to which the slab is attached or upon which it rests or from wh ch it is hung. It is preferable in a building construction that the joints between contiguousrows of' units be staggered in.

order to give maximum results.

While the invention has becnahown and application Serial No. 682,909,.6led L n hr 18 Imv i moaeoa I claim: 1. A precast slab of cementitious material having on opposite edgeportions metallic members with either receiving or receivable parts, the adjacent metallic members on two contiguous slabs when inter-engaged bein adapted together to form an I beam, eac of said metallic members having a web and parts, the ad acent metallic members on two contiguous abs when inter-engaged be n ada ted to ether to form an I beam; each 0 sai metal ic members havin a web. and flanges, one of said members avin a deformed portion entering the body 0 themmentitious material on which said member occurs, to anchor said metal member to said flanges, one of said members having an ody uninterrupted web.

2. A precast slab of cementitious material having on opposite edge portions metallic members with either receiving or receivable parts, the adjacent metallic members on two contiguous slabs when inter-engaged being eac of said metallic members having a web and flanges, a flange of one of said members pro ecting on each side of its web.

3. A precast slab of cementitious material having on o posite edge portions metallic members wit either receiving or receivable parts, the adjacent metallic members on two contiguous s abs when inter-en aged being adapted together to form an I am with a dou le thickness vertical web and triple thickness flanges at the to and bottom thereof, the flanges of one 0 said members being of double thickness. 7

4. The slab of claim 2 in which the other metallic member has a vertical web and to and bottom flanges extending on one si e only of its web.

5. A precast slab of cementitious material having on o 'posite edge portions metallic members wit either receiving or receivable parts, the adjacent metallic members on two contiguous slabs when inter-engaged bein ada ted to ether to form an I beam, each 0 sai metal ic members havin a web and flanges, the flanges of one mem er projecting on each side of its web.

6. A precast slab of cementitious material having on o osite ed e ortions metallic 111 KP g 1? said metallic members havin a web and flanges, a flange on one mem er havin a spring locking portion, a flan e on the ot er member having a spring ock receiving portion.

7. A precast slab of cementitious material having on o posite edge portions metallic members wit either receiving or receivable parts, the adjacent metallic members on two contiguous s abs when inter-en aged being adapted together to form an I earn with a tongued and rooved interlock between the flanges thereo said tongue being defined by the Web and. flanges of one member.

8. A precast slab of cementitious material having on o posite edge portions metallic members wit either receiving or receivable I '9. The slab of claim 8 in which said deformed ortion is in the form of a roove.

10. T e slab of claim 8 in whic the deformed portion takes the form of a longitudinal groove.

11. A precast slab of cementitious material having on o posite edge portions metallic members wit either receiving or receivable parts, the adjacent metallic members on two contiguous'siabs when inter-engaged being adapted together to form an I beam, each of said metallic members having a web and flan es, a flange of one member having a single t ickness overliing its cementitious bo y and a double thic ness portion ro'ectmg outwardly from the cementitious be y.

12. The slab of claim 1 in which the extent of the uninterrupted web of said member is substantiall equal to the thickness of the bod materiaz 13. T e slab of claim 1 in which the webs of both members are uninterrupted and substantially equal in extent to the thickness of the bod material.

14. T e slab of claim 11 in which the other metal member has a web of slightly less extent than the web of the first mentioned metal member and a flange of single thickness entirely overlfying its body material.

15. The slab 0 claim 11 m which one metal member has a web of slightly less extent than that of'the other metal member, and a flange of single thickness entirely overlying its cementitious body, said flange beg ste ped. 16. 'l he slab of claim 7 in which the ve is defined by the web and flanges of t e other member. a

17. The slab of claim 7 in which the move is defined by the web and flanges of e other member, and means at the ends of the flanges of each member depressed into its body to anchor said member to said body.

18. The slab of claim 8 in which said double thickness flanges are integral with its 20. A building construction adjacent precast slabs of cementitious material, each slab having on an edge portion a metallic member inter-engaging a metallic member on an edge portion of the other slab to form an I beam, each member havin a web and flanges, the web of one member ing uninterru ted.

21. A building construction including two adjacent precast slabs of cementitious material, each slab having on an edge portion a metallic member inter-engagin a metallic member on an edge portion of t e other slab to form an I beam, each member having a web and flanges, one of said member flanges being of multiple thickness and integral with its web.

22. A building construction including two adjacent precast slabs of cementitious material, each slab having on an edge portion a metallic member inter-engaging a metallic member on an edge portion of the other slab to form an I beam, each member having a web and flan a flan e of one of said members pro'ectmg on eac side of its web.

23. A uilding construction including two adjacent precast slabs of cementitious material, each slab having on an edge portiona metallic member inter-engaging a metalhc member on an edge portion of the other slab to form an I beam, each member having a web and flanges, said I beam having a double thickness vertical web and a triple thickness flange at the top and bottom thereof 24. A building construction including two adjacent recast slabs of cementitious material, each slab having on an edge port1on a metallic member inter-engagin a metallIc member on an edge portion of t e other slab to form an I beam, each member having a web and flanges, a flange of one member projecting on each side of its web, the other member having a flange on one side of its web only.

25. A building construction including two adjacent recast slabs of cementitious material, eac slab having on an edge portion a metallic member inter-engagm a metallic member on an edge portion of t e other slab to form an I beam, each member havlng a web and flanges, said I beam having a two part .flange, the parts being spring mterlocked together. n j

26. A building construction including two adjacent precast slabs of cement1tious material each slab having on an edge portion meta '0 member inter-engegiifi a metalhc member on an edge portion of e other slab to form an I beam, each memberhaving a web and flanges, said slabs being tongued angdgrooved together said tongue being defin by the web and flanges of the metal member on that slab." a

27. A building construction incl two adjacent precast slabs of cementitious material, each slab having on an edge portion a metallic member inter-enga a metallic member on an edge portion of t e other slab to form an I beam, each member having a web and flanges one of the flanges of one of the members aving a deformed portion enteri its body material.

28. e buildin construction of claim 27 in which the de ormed portion takes the form of a groove.

29. The buildin construction of claim 27 in which the de ormed portion takes the form of a longitudinal groove.

30. A building construction including two adjacent precast slabs of cementitious material, each slab having on an edge portion a metallic member inter-engagin a metallic member on an edge portion of t e other slab to form an I beam, each member having a web and flanges, the web of one of said members being 0 single thickness, said member flange having a single thickness overlying its cementitious body and a double thickness projecting outwardly from said cementitious 31. A building construction including two adjacent recast slabs of cementitious material, eac slab having on an edge portion a metallic member inter-engagin a metallic member on an edge portion of t e other slab to form an I beam, each member having a web and flanges, the vertical web of said resultant I beam bein of an extent substantially equal to the thickness of the body material and uninterrupted.

32. The building construction of claim 31 in which the web of the resultant I beam is of double thickness.

33. The building construction of claim 80 in which the web of the other metallic memher is of slightly less extent than the web of the first mentioned member, and its flan each of single thickness overlying the b The building construction of claim 80 in which the other metallic member has a vertical web of slightl less extent than that of the first mentioned member, a flange of single thickness overlying the slab body, said flange bein stepped.

35. A bu ding construction including two adjacent recast slabs of cementitious material, eac slab having on an edge portion a metallic member inter-enga a metallic member on an edge portion of t 0 other slab to form an I beam, each member having a web and flanges, the web and ii of one of said members defining a tongu the web and flan hof thine gtlier membegede 0. ve, eigtotetone ing'ty less than the height of t5: ve,

36. The building copstruction of claim 35 with means at the end of each of said depressed into that slab body to anchor said member to that body.

1,soo,aos

37. A building construction including two adjacent recast slabs of cementitious material, eac slab having on an edge portion a metallic member inter-enga g a. metallic member on an edge portion o tlie other slab to form an I beam, each member having a web and flanges, two of said flange thicknesses at each end of the web of the resultant I bgam being integral with a portion of its we 38. A building construction including two adjacent precast slabs of cementitious material, each slab having on an edge portion a metallic member inter-engaging a metallic member on an edge portion of the other slab to form an I beam, each member havin a web and flanges, the flanges of each mem r extending on each side of its web.

In testimony whereof, I have hereunto subscribed my name this 16th day of December 1932.

CLARKE F. DAVIS.

CERTIFICATE OF CORRECTION.

Pattnt No. l,900,805. March 7, 1933.

CLARKE F. DAVIS.

it is hereby certified that the above numbered patent was erroneously issued to the patentee said "Davis", whereas said patent should have been issued to "State; tural Gypsum Corporation, of New York, N. Y., a corporation of Delaware. as assignee of the entire interest in said invention as shown by the records of assignments in this office; this correction therein that the the Patent Office. H

Signed and sealed this 25th day of April. A. l). [933.

name may coniorm to the record of the case in (Seal) Acting cditnt auidli i tt Pam and that the said Letters Patent should be read with 1,soo,aos

37. A building construction including two adjacent recast slabs of cementitious material, eac slab having on an edge portion a metallic member inter-enga g a. metallic member on an edge portion o tlie other slab to form an I beam, each member having a web and flanges, two of said flange thicknesses at each end of the web of the resultant I bgam being integral with a portion of its we 38. A building construction including two adjacent precast slabs of cementitious material, each slab having on an edge portion a metallic member inter-engaging a metallic member on an edge portion of the other slab to form an I beam, each member havin a web and flanges, the flanges of each mem r extending on each side of its web.

In testimony whereof, I have hereunto subscribed my name this 16th day of December 1932.

CLARKE F. DAVIS.

CERTIFICATE OF CORRECTION.

Pattnt No. l,900,805. March 7, 1933.

CLARKE F. DAVIS.

it is hereby certified that the above numbered patent was erroneously issued to the patentee said "Davis", whereas said patent should have been issued to "State; tural Gypsum Corporation, of New York, N. Y., a corporation of Delaware. as assignee of the entire interest in said invention as shown by the records of assignments in this office; this correction therein that the the Patent Office. H

Signed and sealed this 25th day of April. A. l). [933.

name may coniorm to the record of the case in (Seal) Acting cditnt auidli i tt Pam and that the said Letters Patent should be read with

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