US3756049A - Axial pin tumbler lock assembly and combination reset key therefor - Google Patents

Axial pin tumbler lock assembly and combination reset key therefor Download PDF

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Publication number
US3756049A
US3756049A US00172991A US3756049DA US3756049A US 3756049 A US3756049 A US 3756049A US 00172991 A US00172991 A US 00172991A US 3756049D A US3756049D A US 3756049DA US 3756049 A US3756049 A US 3756049A
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United States
Prior art keywords
reset
tumblers
lock
cylinder
key
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Expired - Lifetime
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US00172991A
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English (en)
Inventor
W Kerr
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Chicago Lock Co
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Chicago Lock Co
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B27/00—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in
    • E05B27/02—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in operated by the edge of the key
    • E05B27/08—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in operated by the edge of the key arranged axially
    • E05B27/083—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in operated by the edge of the key arranged axially of the split-pin tumbler type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00—Locks
    • Y10T70/70—Operating mechanism
    • Y10T70/7441—Key
    • Y10T70/7486—Single key
    • Y10T70/7508—Tumbler type
    • Y10T70/7559—Cylinder type
    • Y10T70/7588—Rotary plug
    • Y10T70/7593—Sliding tumblers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00—Locks
    • Y10T70/70—Operating mechanism
    • Y10T70/7441—Key
    • Y10T70/7729—Permutation

Definitions

  • a reset key is provided for releasing the front cylinder part from the intermediate cylinder part without releasing the intermediate cylinder part, thus effecting a new alignment of tumbler pieces and a combination change so that a different operating key is required for each combination change of which the lock is capable.
  • the reset key is incapable of effecting unlocking operations.
  • the improved axial pin tumbler lock assembly comprising the present invention is primarily designed for use in connection with the door of a vending machine cabinet where managerial policy dictates that the pin tumbler combinations of the lock assembly shall be changed frequently, usually on the order of at least once each week.
  • the invention is, however, capable of other uses, and lock assemblies embodying the principles of the present invention may find wide application in otherfields as, for example, in connection with parking meters, self-service gasoline dispensing pumps, safety deposit boxes and other lock applications too numerous to mention.
  • the invention is concerned primarily with a lock assembly of the axial pin tumbler type wherein the split tumblers that are associated therewith are circumferentially spaced about and extend parallel to the central longitudinal axis of the lock barrel, are spring-biased or pressed towards the front end of the lock barrel, and are designed for cooperation with a key having circumferentially spaced, tumbler-engaging shoulders which are adapted, when the key is inserted into said front end of the lock barrel, to engage the forward ends of the split tumblers and shift or depress said tumblers rearwards.
  • This type of lock assembly is widely used in connection with vending machines which are installed in public places such as subway stations and the like.
  • pin tumblers must be cataloged so that the operator will know their successive order of replacement in the various lock assemblies and, therefore, an operator who is not only skilled from the point of view of workmanship, but one who also has the ability to perform a certain amount of bookkeeping work, must be employed.
  • An additional limitation resides in the fact that when such an operator works from the back side of a cabinet door, the necessarily open door is frequently a hinderance to people passing by such as are encountered on a subway platform for example.
  • An important feature of the present invention resides in the fact that the special reset key does not have the ability to effect unlocking operations, the lock assembly remaining in its locked condition during combination changeover operations andxthe only key to which the lock will respond is a key which has been cut according to the combination which is brought about by use of the special reset key.
  • the function of the special reset key is entirely a resetting function and its use is accomplished simply by inserting the same in the circular keyreceiving opening in the front end of the barrel of the lock assembly and turning the same throughout a calculated or predetermined angle in order thereby to effect within the lock barrel certain tumbler shifting movements by means of which the existing combination of pin tumblers will be destroyed and a new combination will be supplied.
  • the reset key it is not necessary that the cabinet or other structure to which the lock assembly is applied beopened, nor in fact is it possible for the reset operator to open such cabinet unless he is specifically supplied with an operating key which is cut for the combination that is to be changed or for the new combination.
  • the reset operator will not be supplied with an operating key of any sort, his only equipment being in the form of a single reset key. Neither is it necessary for the operator to remove any portion of the lock assembly and, in fact, it is not even necessary for the operator to handle or even touch the lock assembly, his only function being to insert the reset key into the circular key-receiving opening in the front end of the lock barrel, then turn the key to the desired combination change, then withdraw the reset key, and finally proceed to the next vendingmachine which is to be processed.
  • FIG. 1 is a front elevational view of an axial pin tumbler lock assembly embodying the principles of the present invention
  • FIG. 2 is a longitudinal sectional view taken on the line 2-2 of FIG. 1;
  • FIG. 3 is a transverse sectional view taken on the line 3-3 FIG. 2;
  • FIG. 4 is a fragmentary front perspective view of the lock assembly
  • FIG. 5 is a perspective view of an operating key for the lock assembly of FIGS. 1 to 4; inclusive;
  • FIG. 6 is a perspective view of a reset key by means of which the pin tumbler combination of the lock assembly may be changed;
  • FIG. 7 is a schematic developed homolographic projection of the lock barrel, showing the split pin tumblers in the positions which they assume when the lock assembly is in its locked condition by reason of a prevailing initial pin tumbler combination;
  • FIG. 8 is a homolographic view similar to FIG. 7 but representing the positions of the pin tumblers when a first and proper key is inserted into the front end of the barrel of the lock assembly but before the key is turned in a direction to effect unlocking of the lock assembly;
  • FIG. 9 is a homolographic view similar to FIG. 7 but showing the pin tumblers in the positions which they assume after the special reset key of FIG. 6 is inserted into the lock barrel but prior to turning of such key to effect a change of the tumbler combination;
  • FIG. 10 is a homolographic view similar to FIG. 9 showing the position of the pin tumblers after the reset key has been turned to effect the combination change, but prior to withdrawal of such special reset key from the lock;
  • FIG. 11 is a homolographic view similar to FIG. 10 but showing the position of the pin tumblers after the reset key has been withdrawn and with the new combination of pin tumblers prevailing;
  • FIG. 12 is a homolographic view similar to FIG. 8 but showing the pin tumblers in the positions which they assume when a proper key conforming to the new combination has been inserted in the lock but prior to turning of such key to effect unlocking of the assembly.
  • FIGS. 1 to 4 inclusive a preferred form of lock assembly which is constructed according to the present invention is designated in its entirely by the reference numeral 10.
  • a key for operating the lock assembly to lock and unlock the same is shown in FIG. and identified by the reference numeral 12.
  • a reset key which is illustrated in FIG. 6 and is designated in its entirety by the reference numeral 13 is capable of operating the lock assembly for the purpose of changing the pin tumbler combination thereof, but is incapable of either locking or unlocking the assembly.
  • the lock assembly 10 is of the axial pin-tumbler type, which is to say that it is provided with an annular series of circumferentially spaced split pin tumbler arrangements including tumblers which extend in the axial direction of the lock barrel and are shiftable endwise upon engagement of the front reset tumblers of the split tumbler arrange ments with outwardly facing tumbler-actuating shoulders on the operating key 12, as will be described pres ently.
  • the lock assembly 10 involves in its general organization a cylindrical outer tubular barrel 14, he forward end of which is formed with an outwardly turned radial rim flange 16.
  • the barrel 14 is provided with an external screw thread 18 for reception thereover of a nut 20 which cooperates with the rim flange 16 in clamping the lock assembly in position on a cabinet door or the like (not shown).
  • the screw thread 18 is interrupted by the provision of a pair of oppositely disposed flats 22 by means of which the barrel may be gripped by a suitable turning tool such as a wrench.
  • the barrel 14 of the lock assembly 10 serves to enclose a three-part lock cylinder arrangement, the de tails of which will be made clear subsequently, such arrangement being designated by the bracket 24 in the homolographs constituting FIGS. 7 to 12, inclusive.
  • Said three-part lock cylinder arrangement includes a fixed rear part and two rotatable parts in front of the rear part.
  • the fixed cylinder part is comprised of a lock cylinder proper 30 which is anchored to the barrel 14 by means of a radial pin 32, the cylinder proper thus being non-rotatable and forms the fixed rear part of the three-part lock cylinder arrangement 24.
  • Rotatably disposed within the barrel 14 is an elongated, longitudinally extending lock shaft 34 embodying a rear clyindrical section 36 (see FIG. 2) which projects through v and is coextensive with a central bore in the lock cylinder proper 30.
  • a front cylindrical section 38 on the lock shaft 34 is formed with a rounded outer or front end 40 and this lies within the confines of a circular key-receiving opening 42 within an inwardly extending rim flange 44 at the front end of the barrel 14.
  • This front cylindrical section 38 constitutes a key-centering post which, in connection with axial tumbler-type lock assemblies, is commonly referred to as a centerpost.
  • the lock shaft 34 is further provided with an intermediate cylindrical section 46 in the form of a radial lock shaft flange, the diameter of which is substantially equal to the internal diameter of the barrel l4 and, consequently, to the outer diameter of the lock cylinder proper 30.
  • This intermediate section 46 constitutes one of the two rotatable parts of the lock cylinder arrangement 24.
  • the rear end of the lock shaft 34 is provided with a short reduced extension 48 which projects through the usual washer 50 and is formed with a pair of diametrically opposite flats 52. The latter cooperate with a radially extending locking cam 54 which turns with the lock shaft 34 into and out of locking position as is well known in the art.
  • a nut 56 is threadedly received on the outer extremity of the lock shaft extension 48 and serves to hold the locking cam in a clamped position against the washer 50.
  • the lock cylinder proper 30 is provided with an annular series of circumferentially spaced, axially extending cylindrical sockets 58, each of which slidably receives therein a non-rotative follower tumbler 60 of a three-piece split'pin tumbler arrangement.
  • the rear ends of the sockets 58 are closed and the front ends of the sockets are open.
  • Each follower tumbler 60 is designed for cooperation with a rotative driver tumbler 62 which forms the intermediate piece of said threepiece tumbler arrangement and is slidably disposed in an axially extending bore 64 in the intermediate cylindrical section 46 of the lock shaft 34.
  • the bores 64 are arranged in an annular series. They are o en at both ends and correspond in number to the sockets 58.
  • a reset cylinder which constitutes the other rotatable part of the three-part lock cylinder arrangement 24 is rotatable in the barrel l4 and is disposed on that side of the intermediate cylindrical section 46 of the lock shaft 34 that is remote from the lock cylinder proper .30. It has a central circular hole for receiving the front cylindrical section 38 of the lock shaft 34 and is provided with an annular series of bores 72. The latter correspond in number to the bores 64 in the inter mediate cylindrical section 46 of the lock shaft 34 and are movable into and out of register with said bores 64. Each bore 72 slidably receives therein a reset tumbler 74 which forms the third and front piece of said threepart tumbler arrangement and, in effect, functions as der arrangement is possible and the lock assembly remains in its locked condition.
  • the various tumblers assume the positions to which they are shifted when the proper operating key 12 is introduced into the lock assembly, the shoulders 88 on the key being cut so that each three-piece pin tumbler arrangement presents a split which lies in the interfacial plane l-l.
  • one or more tumblers project across the interfacial plane rr so that no relative turning movement between the upper reset fill and the intermediate fill is possible.
  • the two uppermost fills may turn bodily as a unit with respect to the lower fill for locking and unlocking operations.
  • the operating key 12 is shown as being introduced into the lock assembly but not as yet turned. The net result is that the intermediate and lower fills are released from each other so that turning of the key will result in causing the lock assembly 10 to be unlocked.
  • FIG. 9 a condition is illustrated wherein the special reset key 13 has been introduced into the lock assembly 10 but has not yet been turned for a reset operation.
  • the upper fill and the intermediate fill are thus released from each other while the intermediate fill and the lower fill remain coupled to each other by reason of one or more tumblers projecting across the interfacial plane l-l.
  • the various shoulders 188 on the reset key have thus pushed the three-piece pin tumbler arrangements inwardly in order to bring the splits between the reset tumblers 74 and the driver tumblers 62 into register with the upper and intermediate fills.
  • FIG. 10 of the drawings a condition is illustrated where the reset key 13 has been turned one increment of step so that the upper fill has rotated throughout a small angle in order to bring the reset tumbler A (one of eight) into register with the driver tumbler b (also one of eight), the reset tumbler B into register with the driver tumbler c, the reset tumbler C with the driver tumbler d, and so on, the reset tumbler H finally regis tering with the driver tumbler a.
  • the reset key 13 is devoid of an alignment lug such as the lug 90, the same is capable of being inserted into the lock assembly in any selected angular position. It is also capable of being withdrawn from the lock assembly in any desired angular position. However, unless such reset key 13 is introduced into the lock assembly 10 in the same angular position which it assumed at the timeit was last withdrawn from the lock assembly, it cannot be turned for resetting operations inasmuch as the shoulders 188 which are provided thereon must cooperate with the reset tumblers 74 in such a manner as to depress such tumblers to positions wherein their inner ends lie in the interfacial plane rr in order thus to release the upper fill from the intermediate fill.
  • the front end face of the barrel l4 i.e., the front rim thereof, may be provided with numerical or other indicia such as are illustrated in FIG. 1 and designated by the reference numeral 98.
  • An axial pin tumbler lock comprising, in combination, a generally cylindrical open-ended tubular lock barrel having at its front end a fixed inturned rim flange defining a front central and circular key opening, a rigid, functionally one-piece lock shaft projecting centrally and axially through said lock barrel and embodying a front cylindrical section which projects forwardly and terminates in the vicinity of said central key opening and constitutes a centerpost for selective reception thereover of a tubular reset key and a tubular operating key, a rear cylindrical section which terminates adjacent to the rear end of the barrel and embodies means between it and said rear end of the barrel to prevent forward axial displacement of the lock shaft with respect to said barrel, and an intermediate cylindrical section in the form of a radial lock shaft flange the diameter of which is greater than the diameter of either .the front or rear cylindrical section and is also equal to an interchangeable extension for the associated driver tumbler 62.
  • the reset tumblers 74 also function as driver tumblers themselves in that, when they are depressed by the reset key 23, they shift the positions of the driver tumblers 62 as well as the follower tumblers 60.
  • the reset cylinder 70 and the reset tumblers 74 which are carried thereby constitute the principal feature of the present invention.
  • the reset tumblers 74 normally bear forwardly against an annular shoulder 76 which is established by the inner face of the inwardly extending rim flange 44 on the front end of the barrel 14, these tumblers being yieldingly biased against said shoulder by means of an annular series of helical compression springs 78.
  • the latter correspond in number to and are disposed respectively in the rear ends of the sockets 58 in the lock cylinder proper 30.
  • the springs are piloted on posts 80 which are formed on the rear ends of the follower tumblers 60. The compression in the springs 78 is transmitted through the driver tumblers 62 to the reset tumblers 74.
  • the lock barrel 14 serves to enclose the three parts 30, 46 and 70 of the lock cylinder assembly 24 and that these three parts establish among themselves two interfacial planes which are designated, respectively, in FIGS. 7 to 12 by the broken lines rr and 1-1.
  • the interfacial plane rr will be referred to as the reset" plane and the interfacial plane l--l will be referred to as the locking" plane.
  • the reset plane is established by the interface between the reset cylinder 70 and the intermediate cylinder section 46 of the lock shaft 34.
  • the locking plane is established by the interface between the intermediate cylindrical section 46 and the lock cylinder proper 30.
  • the reset cylinder 70 is free to turn throughout an arc of 360 with respect to the intermediate cylindrical section 46 of the lockshaft 34.
  • certain of the driver tumblers 62 are of different length and certain of the reset tumblers 74 are of different length. This is both important and necessary to proper workability of the present lock assembly.
  • the follower tumblers, the driver tumblers, and reset tumblers form three-part only tumbler arrangements.
  • the operating key 12 includes a cylindrical body portion 82, one end of which is notched in order fixedly to receive the usual manipulating wing 84.
  • the body portion 82 of the regular operating key 12 is tubular to the end that it has a deep internal axial socket 86 which is designed for reception over the centerpost 38 (front cylindrical section of the lock shaft 34) in telescopic relationship when the key is initially introduced into the lock assembly through the circular key-receiving opening 42.
  • the key 12 is privided with bitting which embodies an annular series of forwardly facing shoulders 88 which are cut to different depths in the outer periphery of the rim region of the body portion 82 of the operating key 12 and these shoulders are adapted to engage the extreme forward ends of the reset tumblers 74 for tumbler shifting purposes.
  • an external alignment lug 90 is provided on the body portion 82 and is adapted to project into an inwardly facing notch 92 (see FIGS. 1 and 4) in the inwardly extending rim flange 44 of the barrel 14.
  • An internal lug 94 is provided on the rim portion of the key body 82 and is designed for cooperation with a longitudinally extending groove 96 which is formed in the centerpost 38 of the lock assembly 10.
  • FIGS. 7 to 12 The operation of the present lock assembly 10 may best be set forth by reference to the homolographic views of FIGS. 7 to 12, inclusive.
  • the threepiece split pin tumbler arrangement represents the condition of the cylinder arrangement 24 when a first established tumbler combination prevails and the lock assembly is in its locked condition with no key in the lock.
  • the reset tumblers 74 are labelled A, B, C, D, E, F, G and H in FIG. 7, while the driver tumblers 62 are labelled a, b, c, a, e,f, g and h. This same labelling is preserved throughout all of FIGS. 7 to 12.
  • An axial pin tumbler lock comprising, in combination, a generally cylindrical open-ended tubular lock barrel having at is front end a fixed inturned rim flange defining a front central and circular key opening, a centerpost of circular cross section extending centrally and axially through the front end portion of the lock barrel, terminating in the vicinity of said central key opening and adapted for selective reception thereover of a tubular reset key and a tubular operating key, a rigid functionally one-piece lock shaft projecting centrally and axially through the intermediate and rear end portions of said lock barrel and embodying a rear cylindrical section which terminates adjacent to the rear end portion of the barrel and embodies means between it and said rear end portion of the barrel to prevent forward displacement of the lock shaft with respect to said barrel, and a radial lock shaft flange which is disposed between the centerpost and the rear cylindrical section and the diameter of which is greater than the diameter of the centerpost and said rear cylindrical section and is equal to the internal diameter of the lock barrel, locking means operatively connected to said rear cylindrical section of

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US00172991A 1971-08-19 1971-08-19 Axial pin tumbler lock assembly and combination reset key therefor Expired - Lifetime US3756049A (en)

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Application Number Priority Date Filing Date Title
US17299171A 1971-08-19 1971-08-19

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US00172991A Expired - Lifetime US3756049A (en) 1971-08-19 1971-08-19 Axial pin tumbler lock assembly and combination reset key therefor

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US (1) US3756049A (enExample)
JP (1) JPS5123232B2 (enExample)
AU (1) AU452834B2 (enExample)
CA (2) CA942522A (enExample)
DE (1) DE2206484A1 (enExample)
FR (1) FR2124953A5 (enExample)
GB (1) GB1386371A (enExample)
IT (1) IT952823B (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961507A (en) * 1975-01-17 1976-06-08 Fork Lock Corporation Resettable axial pin tumbler lock
US4712402A (en) * 1986-06-16 1987-12-15 Monahan Brian J Integrally and sequentially re-keyable lock apparatus and method
US5018376A (en) * 1989-03-27 1991-05-28 Lee David G High security axial pin tumbler lock
WO1991014843A1 (en) * 1990-03-19 1991-10-03 Lee David G Improved high security axial pin tumbler lock
EP0860566A1 (en) * 1997-02-20 1998-08-26 Camlock Systems Plc Lock and key combination
US20070033975A1 (en) * 2003-02-21 2007-02-15 Shun-Ming Liu Dual power protective device for power supply
US20070209415A1 (en) * 2006-02-07 2007-09-13 Jin Tay Industries Co., Ltd. Lock with a limiting slide assembly

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5086391U (enExample) * 1973-12-11 1975-07-23
JPS609194B2 (ja) * 1975-04-07 1985-03-08 孝男 本田 軸方向ピンタンブラ−錠
JPS5571206A (en) * 1978-11-20 1980-05-29 Shibuya Kogyo Co Ltd Device for packing in box
JPS6193004A (ja) * 1984-10-09 1986-05-12 株式会社　イズミフ−ドマシナリ 多数個の個装製品自動集積箱詰装置
RU2090720C1 (ru) * 1995-10-13 1997-09-20 Александр Леонидович Синцов Замок
RU2105119C1 (ru) * 1996-07-24 1998-02-20 Александр Леонидович Синцов Замок
RU2132439C1 (ru) * 1998-07-29 1999-06-27 Синцов Александр Леонидович Замок
RU2141024C1 (ru) * 1999-03-23 1999-11-10 Синцов Александр Леонидович Замок

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3320783A (en) * 1966-12-09 1967-05-23 Chicago Lock Co Key for an axial tumbler type lock
US3411331A (en) * 1967-01-10 1968-11-19 Schlage Lock Co Axial pin cylinder device
US3422646A (en) * 1967-03-15 1969-01-21 Brian J Monahan Instantaneous tumbler change lock

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3320783A (en) * 1966-12-09 1967-05-23 Chicago Lock Co Key for an axial tumbler type lock
US3411331A (en) * 1967-01-10 1968-11-19 Schlage Lock Co Axial pin cylinder device
US3422646A (en) * 1967-03-15 1969-01-21 Brian J Monahan Instantaneous tumbler change lock

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961507A (en) * 1975-01-17 1976-06-08 Fork Lock Corporation Resettable axial pin tumbler lock
US4712402A (en) * 1986-06-16 1987-12-15 Monahan Brian J Integrally and sequentially re-keyable lock apparatus and method
US5018376A (en) * 1989-03-27 1991-05-28 Lee David G High security axial pin tumbler lock
WO1991014843A1 (en) * 1990-03-19 1991-10-03 Lee David G Improved high security axial pin tumbler lock
EP0860566A1 (en) * 1997-02-20 1998-08-26 Camlock Systems Plc Lock and key combination
US20070033975A1 (en) * 2003-02-21 2007-02-15 Shun-Ming Liu Dual power protective device for power supply
US20070209415A1 (en) * 2006-02-07 2007-09-13 Jin Tay Industries Co., Ltd. Lock with a limiting slide assembly
US7475579B2 (en) * 2006-02-07 2009-01-13 Jin Tay Industries Co., Ltd. Lock with a limiting slide assembly

Also Published As

Publication number Publication date
JPS5123232B2 (enExample) 1976-07-15
AU452834B2 (en) 1974-08-26
CA963684B (en) 1975-03-04
IT952823B (it) 1973-07-30
FR2124953A5 (enExample) 1972-09-22
AU4077172A (en) 1973-10-11
DE2206484A1 (de) 1973-08-02
GB1386371A (en) 1975-03-05
CA942522A (en) 1974-02-26
JPS4830597A (enExample) 1973-04-21

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