US2072447A - Tabulating machine - Google Patents
Tabulating machine Download PDFInfo
- Publication number
- US2072447A US2072447A US566443A US56644331A US2072447A US 2072447 A US2072447 A US 2072447A US 566443 A US566443 A US 566443A US 56644331 A US56644331 A US 56644331A US 2072447 A US2072447 A US 2072447A
- Authority
- US
- United States
- Prior art keywords
- contacts
- brushes
- card
- slides
- machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K13/00—Conveying record carriers from one station to another, e.g. from stack to punching mechanism
- G06K13/02—Conveying record carriers from one station to another, e.g. from stack to punching mechanism the record carrier having longitudinal dimension comparable with transverse dimension, e.g. punched card
- G06K13/07—Transporting of cards between stations
- G06K13/077—Transporting of cards between stations with intermittent movement; Braking or stopping movement
Definitions
- This invention relates to perforated card controlled machines and more particularly to a de-V vice for making electrical connections between various parts of the machine.
- terminal contacts are provided to take the place of j vbrushes are tobeconnected to the accumulator-3 40 andv printing'magnets so that data may be taken from any of the columns on the data cards'and caused to control any of the orders ofv the ac? cumulators or columns.
- vof printing elements by being variously connected to the magnets whichv control the accumulating and printing.
- the present invention does away with the necessity of using plug wires to inter :onnect the sensing brushes and accumulating and printing 50 magnets and provides a set of settable contact slides tof accomplish the same result. These slides may be set manually, if desired, or they may be set undercontrol of the report card or,
- a card may have been punched to control the making of a particular form of" report and in special instances it may be desired 5 to vary certain items in the report. These slight variations may be -eiected by first setting the various slides under control of the card and then changing the particular ones desired to elect the particular type of report required. 10
- the groups of cards are divided into major and minor groups as, for instance, whenl reports have been made covering the several 25 months and the various days of the months. In such cases, the groups of ⁇ cards may be divided into minor groups covering the days and major groups covering/the months.
- the setting of the machine. to operate to take totals of major and minor groups is also eecte'd by the setting of slides under control of the report or' form card.
- the accumulator may be caused to clear so that each days total will be separate from each other day or the machine may be set totake progressive or accumulative totals so that each days total will be included with the totals of the preceding days of the month.
- the connections to control this are also eected by the setting of the slides either manually or under control of the form report card. In other words, connections may be made with respect to each of the accumulators in the machine to cause them to clear after the printing of minor totals or after the printing of major totals.
- the accumulator which controls the printing of major totals will, of course, be set to accumulate data taken from all of the cards of all of the minor groups included in the major group without any clearing operations until after the printing of the major total.
- this accumulator may be set to accumulate progressive major totals so that when the last major total is printed it will include Aall preceding major totals or, in other words, will constitute a grand total of all of the major totals.
- Fig. 1 is a sectional side elevation of a device constructed in accordance with my invention and adapted to be used to control the operation of the tabulating machine.
- Fig. 1a is an enlarged detail of a control setting device.
- Fig. 2 is a section of a different part of the device showing a different one of the movable slides.
- Fig. 3 is a view similar to Fig. 2 with the parts in different positions.
- Figl 4 is a section taken on line 4-4 of Fig. 3.
- Fig. 5 is a view of a punched card adapted to be used to control the setting of the several slides.
- Fig. 6 is a sectional elevation ofthe device show- I chine are very well known and are disclosed in numerous issued patents including Patent No. 1,762,145. Only so much of the machine is shown diagrammatically as will be necessary to an understanding of the present invention and the manner in which it is used in connection with well known tabulating machines.
- a stack of perforated data cards I is shown in position ready to be fed one at a. time by the card picker 2 to the feed rollers 3.
- Each card is fed downwardly between the upper sensing brushes 4 and cooperating contact blocks 5 and then between the'lower sensingV brushes 6 and corresponding contact blocks "I,
- the successive index point positions of a column of one card are fed past the lower brushes 6, the corresponding index point positions of t e next succeeding card are being fed past the up r sensing brushes 4.
- the closing of electric circuits through the lo ⁇ er brushes 8 serves to control the machine to ⁇ ccumulate and print data contained on the card.
- the card under the upperv brushes belongs to a diiferent group, or in other words, if the card under the lower brushes is the last of apa ticular group the feeding of cards ceases mom ntarily yhile the machine passes into a totaling cycle of operations during which the total of the preyious group is printed.
- the accumulator in whiclrthe total was accumulated may then be cleared if desired after which the card feeding is resumed. When this takes place the card which was under the upper brushes and brought about the taking of the total is fed to the lower brushes and its data is taken and accumulated and also printed, if the machine is set for such operations.
- the machine is operated by an electric motor 8 driving a shaft 9 through a belt I0.
- a clutch II is adapted to connect a shaft I2 to the normally running shaft 9 in order to effect the driving of the cam shaft I3 and the feed rollers 3 and card picker 2.
- the motor 8 is shown Within dotted lines in the upper part of the diagram along with its windings I4.
- the source of electric current for operating the machine is represented at I5 and may be connected to the lines I6, I'I by a switch I8.
- the operation of the machine may be started by depression of a start key I9. This will close contacts 20 and complete a circuit through the motor 8 as follows: from the positive side of the line I6 through the winding of the motor 8, through relay coil 2I through the card feed clutch coils 22, relay coil 23. contacts 20 now closed, to the point 24, contacts 25a normally closed, stop button contacts 26 also normally closed to the point 21, contacts 28 which are closed at this time and to the negative side of the line I 1.
- the machine may also be stopped at any time while cards are being fed, by the depression of This also breaks the circuit through the motor and the cardfeed clutch.
- the closing of a contact is adapted to feed current' to/ these contacts 33 and if they are found t0 be/closed the machine continues to feed .cards and accumulate data.
- a plugv socket is also normally provided .in thejplug board of this machine'so that a plug connection may be vmade from socket 35 to any of the sockets l.34 and in this way eliminating from the circuit, all of the contacts 33 to the right of the socket 34 which is thus connected to socket 35.
- group controlling is being effected through only one column on the card, it will only be necessary to use one of the contacts 33, namely, the one farthest to the left in Fig. 8a.
- the socket 34 farthest to the left will be connected by plugging to the socket 35 and a circuit from line 36 will pass through the contact 33 to the first plug socket'34. across vthe A.plug line to the plug socket 35 and so forth.
- the group control contacts 33 may be split by r 34, 35, contact slides are moved to any of several possible positions to eiect the desired connections between the sockets 34 and 35.
- the connccting slides and contacts may be applied to the machine as an attachment and permanently connect-ed to the plug sockets 34, 35; or the device may be built into the machine as an integral part thereof and connections to the contacts 33 may be made permanently, eliminating the sockets 34, 35.
- the A sockets 31, 38 make it possible to connect .the other parts of the machine to any of the brushes 4, 6, so that the data contained in various columns on the cards may be caused to control any .accumulator or any order in an accumulatorvand any column of vtype in the printing section of the machine.
- Sockets 39, 40 (Fig. 8c) also in the plug board are associated with the individual columns of the accumulators and type and the connections from sockets 31, 38 to the sockets 39, 40 are made in various combinations as desired.
- these various connections are also effected through the setting of contact slides.
- the device may be connected to the accumulators by plug connections in sockets 39, 40,.orthe device may be built into the machine as stated' and the sockets and plug board omitted, the wires from the interconnecting slides lto the accumulators and type control magnets being direct.
- , 42 normally provided in the plug board for the purpose of connecting any ofthe brushes or columns on a card to the group control device may also be omitted and the connections made ,directlyA to the control slides.
- the control slides are shown as conf nected through the sockets 4
- the casing or frame 43 is shown as having brackets 44 supporting ka each of which, is.
- Each bar ,41 carries a plurality of contact brushes ⁇ 48 adapted to engage the bars 45.
- the slides 4'1 are .adapted to be moved to the right or left to bring the brushes 48 into engagement with different bars 45.
- the brushes 48 are spaced along the -slide 41 at a distance corresponding to the distance between ten of the bars 45.
- slide 41 is provided with similar brushes 48a, each pair of brushes 48, 48a being electrically interconnected through rivets 49 byV which they are ⁇ attached to the slide 41.
- the brushes 48a are adapted to slide upon contact strips 50 carried by an insulating block 5I.
- each group of ten bars 45 may be connected through its brush 48 and corresponding brush 48a to a Contact strip 50 which is thus common to the ten bars 45. It will thusy be seen that by adjustment of the slide 41 a particular contact strip 50 may be connected to any one of the corresponding group of ten sensing brushes 4 through the bars 45.
- a bracket 44a is shown supporting a plurality of bars 45a similar to the bars 45.
- Each bar 45a is connected by a wire 46a to one of the brush contact blocks 1 associated with the lower perforation sensing brushes 6.
- Integral with thesliding bar 4l is another slide 41a.
- This slide carries contact brushes 52, 52a, interconnected by rivets 49a.
- the brushes 52 are adapted to cooperate with the bars .45a while the brushes 52a are adapted to cooperate with contact strips 56a carried on an insulating block 5ta.
- the slide 41a is moved to the right or left with the slide 41 so that when the latter is adjusted to bring its brushes 48 into cooperation with certain of the bars 45, the brushes 52 will r be adjusted to cooperate with corresponding lower bars 45a.
- a brush 48 is adjusted to cooperate with a particular one of the several upper perforation sensing brushes 4, a brush 52 will be adjusted to cooperate with the 'corresponding lower perforation sensing brush 6.
- the vertically alined rivets 56 of a pair of opposite brushes 54 and 55 have their enlarged rear ends or bases seated in alined recesses internally formed in the two layers which make up slide 53. As seated in these recesses, the alined rivets have their bases spaced apart and out of engagement so that the opposite brushes 54 and 55 remain insulated from each other by slide 53, as ndicated in Figs. 1 and 8b.
- the brushes 54 are adapted to cooperate with contact strips 50 while the brushes 55 are adapted to cooperate with contact strips 50a.
- the slide 53 is adjustable to the right or left to bring one of its sets of brushes 54, 55 into cooperation with corresponding upper and lower contact strips 50, 50a. There are ve of the contact strips 50 and corresponding strips 50a and therefore ve sets of brushes 54, 55. In any given position of the slide 53, one only of the sets of brushes 54, 55 will cooperate With opposite strips 50, 50a.
- the slide 53 may be termed the tens order slide and the slide 41 the'units order slide.
- the device Assuming that the device is to be used in connection with tabulating machines adapted to be controlled by perforated cards having 45 columns of data, there will be 45 of the bars 45 and 45a.
- the bar farthest to the right may be used in connection with card counting and the ⁇ bar farthest to the left may be a dummy to receive unused- Wires 46, 46a.
- the bars 45 will be grouped in four groups of ten each and ya, fth group of five; the bars 45a being similarly grouped.
- the barsV 45 and 45a may be similarly numbered beginning at the left from one to forty-five with an extra bar at each end. If it is desired to connect a particular column of card sensing brushes to -effect group control the slides 41, 41a and the slide l53 will be adjusted accordingly: for instance, assuming that contro] is to be eiiected through column 26 on the card, corresponding brushes 4, 6, i. e. those reading that column, will be connected through bars 45, 45a and the slides, to connect with the group control mechanism, by
- Fig. 1 These slides may be adjusted so that they may be variously connected with the ten columns on the card. If some only of the ten columns are to be employed for group control, the corresponding number of settings may be effected and the rest of the slides 41, 41a and 53 left in their normal or inoperative positions.
- Fig. 8b of the wiring diagram l two sets of the contact slides disclosed in Fig. 1 are shown connected to control the operation of the tabulating machine represented by the wiring of Fig. 8a.
- two of the upper card sensing brush contact blocks 5 are connected through wires 46 to the bars 45'and several of the contact bars 1 associated with the lower sensing brushes 6 are connected through wires 46a to the lower bars 45a.
- the insulating blocks 5I, 5la are provided with contact strips 51, 51a. adapted to cooperate with brushes 58, 58a, brush 58 being electrically connected through a common strip 59 to all of the brushes 54, while brush 58a is electrically connected through a common strip 59a to all of the brushes 55.
- the strip 51 is connected by a wire 60 to one of the points or plug sockets 4
- Each of the magnets 6I is associated with one of the sets of contacts 33 in Fig. 8a and is adapted when energized to close its set of contacts 33. It is understood that when any of these sets of contacts is closed during a card reading cycle of the machine, it will remain closed after the magnet 6
- the cam CI will permit the CI contacts to open and if the groupnumbers on the two cards are the same.
- the ⁇ current through the coil 64a will pass around the CI contactsv through the wire 36, the first contact 33, ',(asfsluni-4 ing that we are group controlling on b ut one column) then through wire 66 to a bar 61, -b'rush 68 carried by a slide 69 then to the common strip 10, brush 1I, contact strip 12,'wire 13, bar 14, brush 15, contact strip 16, brush 11, contact 18, wire 19 to the connection point 35, card lever contacts 80, which are closed at this time as long as cards are passing through the machine and back to the line I1.
- the lower contact 64 By thus maintaining the coil 64a energized the lower contact 64 will remain closed and the machine will continue to feed and analyze cards and to accumulate and print the data taken therefrom. If the group control numbers on the i two cards were different, the rst group control contact 33 would not have been closed as current would not have been fed simultaneously through the corresponding upper and lower brushes 4 and 6 and through the coil 6I (Fig. 8b) which serves to close the control contacts 33.
- Deenergization of coil 64a permits the conta ts 64 to return to their normal position with th; upper set closed. Current will then flow from line I6 through, upper contacts 64 to relay coil 25, wire 65 tothe otherside of theline. The energization of coil 25 opens the relay contacts 25a so that the current now flowing through the driving motor 8- and the card feed clutch 22 will fail and feeding of cards will stop.
- Deenergization of the card feed clutch magnet 22 permits contacts 22a, to close. of the card cycle, contacts LI ⁇ close momentarily.
- a switch 82 was, of course; clcsedbeiore the mavchine was startedfif group controllingis to be employed.
- a circuit' will nowfbefsetuprom line I6,.'through the relay coil I ⁇ 83,'f ⁇ x'veset motor RM,
- the reset motor then continues through contacts PI, relay contacts 86,' contacts L2 which are closed throughout a totaling or reset cycle back to the line I1. Near the end of the totaling cycle, contacts PI open and the reset motor RM stops. Also the contacts LP1 close near/the end f the totaling cycle and a circuit is se up frcgi the line I6 through contacts LP1, coil 64a., c tacts CI, L3 and wire 65 to the other side of th line. The relay magnet 64a will now open the pper set .ofr contacts 64 and close the lower set. This will'bijeak the circuit through coil 25 permitting contacts 25a to close.
- control relays 6I for these sets of contacts will be connected to the respective columns on the card by the manipulation of the appropriate six sets of slides 41, 41a. and 53. Now as long as the cards under the upper and lower brushes contain the same major and minor group numbers all of the contacts 33 in the control circuit will be closed so that current passing from the left side of the line for the minor control will pass through contacts 64, relay 64a, wire 36, thenl through the six sets of contacts 33 (including the major group) into the 6 bar 61,through brush 92, strip 16, brush 11, strip 18 to point 35,
- this minor test circuit operates the major test circuit through its contacts 33 will be caused to operat'e by opening of cam contacts L3 which takes place at the same time that contacts C
- Current will then pass from the line I6, through lower contacts 63, holding relay 63a, wire 93, wire 94, contact strip 12, brush 1
- the minor control circuit will failpermitting lower contacts ,64 to open and upper contacts 64 to close, but
- the major control testV circuitxwlll not be broken and the relay 63a will continue to hold the ⁇ lower contacts 63 closed. The machine will then perform one totaling cycle of operations. On the other hand, if a change occurs in the major group control number the major control circuit as well as the minor control circuit will open and the lower contacts 63, 64 will both open and upper contacts 63, 64 will both be closed. This will cause the machine to perform two cycles of resetting and totaling operations.
- contacts LP6 close for a short period and then reopen, but nothing happens at this time because contacts LP1 and lower contacts 64 are open.
- contacts LP1 close completing the circuit through the relay coil 64a as previously described, causing the lower contacts 64 to be closed and the upper contact 64 to be opened. This does not deenergize relay coil 25 at this time because the upper contacts 63 are still closed.
- contacts LP6 k will again close and a circuit will be closed from the line I6 to lower contact 64, contacts LP6, relay coil 63a, contacts L3, wire 65 back to the line
- the energization' of relay 63a will close .the lower contacts 63 and open the upper ones.
- relay coil 25 This breaks the circuit through relay coil 25 permitting contacts 25a to close. It may be pointed out here, that when relay coil 25 is energized coil 86a will also be energized to open the contacts 86. Thus, when lower contacts 64 are closed after the taking of major and minor totals the relay 86a continues to hold the contacts 86 open so that when, during that cycle, the contacts Pl are closed the current cannot pass through the contacts 86 and the relay 84 is permitted to remain energized.
- the fourth of the several brushes 99 is shown as engaging the fourth contact strip 98.
- one of the columns ranging from 30-39 will be connected through the corresponding brushes 91a, 91 to one of the bars 45a.
- the units bar 96 is so adjusted that the several brushes 91 cooperate with the bars 45a of the 2nd, 12th, 22nd, 32nd, and 42nd columns so that the column 32 on the data card will be connectedthrough the corresponding sensing brush to the accumulator order to which the slide
- the circuit, tracing it from the right side of the line, will be through contacts 28 (Fig.
- 09 opens the contacts
- 09 controls the particular order of the accumulator and is immediately deenergized by the opening of the contacts
- the closing of contacts on the other hand closes the listing circuit through
- 2 for effecting printing when listing as well as when totaling is well known and need not be disclosed in detail here. If listing is not to be effected the contacts
- a switch is ordinarily provided to shunt the circuit across the' contacts
- 3 is effected through a slide
- Each of the slides 95 is connected to a link
- Each of the slides 96 passes around to the other side of the frame'
- 41 is mounted directly over a perforated plate
- the form card is adapted to be perforated so that the pins
- 48 is provided with studs
- 59 carried by the plates cooperate with the studs
- 41 may be moved upwardly to coop-
- 59 is an arm
- 63 is provided for rotating the shaft
- the normal position of ⁇ the parts is shown in Fig. 3, the form frame 48 being at the left side of the machine and in raised position.
- 63 clockwise to the position of Fig. 2 will, through the stud
- 63 fromthe position of Fig. 2 to that of Fig. l causes the lowering of the frame'
- the form card is shown in Fig. 5.
- the card is divided into five elds designated l to 5 with perforations for con-y trolling accumulating in the five sets of accumulators.
- Each upper eld is provided with eight perforation positions ⁇ in horizontal rows there being four such rows. In other words, there are eight columns of perforation positions with four positions to each column.
- the lower portion of the field 65 on thel other hand is provided with eight columns with nine perforation positions to a column.
- Each of the upper columns of' perforation positions corresponds with one of the slides and each of the lower columns corresponds with one of the slides 96.
- 49 is shown as having upward extensions
- a setting of the slides 41, 41a(Figs. l and 8b) is effected through a link
- Fig. 6 the slide
- are shown in Fig. '7. The two slides are mounted side by side and so only one of them shows in this view.
- the slide 9i is provided with a link 9
- the slide @9 on the other hand is connected by a link 59a to an offset pin 69h adapted to cooperate with the lower portion
- 63 may be left in the position of Fig. 2 or that of Fig. 1.
- the parts may be restored to their normal positions by turning the crank
- This not only restores the frame
- 45 and slides 96 are provided with projections
- the slides 41, 41a are restored by cooperation of the bar
- the punching is done according to the nature of the report to be made out on the machine under control of the perforated record cards.
- the operator wishing to connect the 33rd column of the perforated record cards to the units order of the 2nd accumulator in the machine will punch 33 in the 26th or units column of the second accumulator on the form card.
- the 26th column on the form card is punched in the tens iield on the line designated 39 and in the units field on the line designated 3.
- 41a is shown.
- This card may be made up of a very thick lower portion covered by a thin upper portion
- the operator will use a pencil to puncture the covering
- a punched card accounting machine having accumulators; two Asets of electric brushes for sensing perforations in two record cards simultaneously; terminal contacts connected to said brushes; total taking control means; and slides having contact interconnecting means connected with the total taking control means, said slidesjoeing movable across said contacts to selectively connect corresponding contacts of the two sets to the total taking control means for causing the machine to take totals under control of the record cards.
- a punched card accounting machine having accumulators; two sets of electric brushes for sensing perforations in two record cards smultaneously; terminal contacts connected to ,said brushes; total taking control means; slides having contact inter-connecting means connected with the total taking control means, said slides being movable across said contacts to selectively connect corresponding contacts of the two sets to the total taking control means for causing the machine to take totals under control of the record cards, and a punchedform card cooperating With the slides for controlling the setting of the slides.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Pinball Game Machines (AREA)
- Time Recorders, Dirve Recorders, Access Control (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DENDAT688212D DE688212C (xx) | 1931-10-02 | ||
US566443A US2072447A (en) | 1931-10-02 | 1931-10-02 | Tabulating machine |
GB27248/32A GB408214A (en) | 1931-10-02 | 1932-09-30 | Improvements in or relating to record-controlled statistical machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US566443A US2072447A (en) | 1931-10-02 | 1931-10-02 | Tabulating machine |
Publications (1)
Publication Number | Publication Date |
---|---|
US2072447A true US2072447A (en) | 1937-03-02 |
Family
ID=24262905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US566443A Expired - Lifetime US2072447A (en) | 1931-10-02 | 1931-10-02 | Tabulating machine |
Country Status (3)
Country | Link |
---|---|
US (1) | US2072447A (xx) |
DE (1) | DE688212C (xx) |
GB (1) | GB408214A (xx) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2838234A (en) * | 1953-07-28 | 1958-06-10 | Zenith Radio Corp | Subscription television code card coupon book |
US2954923A (en) * | 1957-03-27 | 1960-10-04 | Burroughs Corp | Record scanning and decoding apparatus |
US3036764A (en) * | 1958-09-11 | 1962-05-29 | A Kimball Co | Record decoding apparatus |
US3132241A (en) * | 1960-07-18 | 1964-05-05 | Ibm | Badge-reading apparatus |
US3343481A (en) * | 1965-03-29 | 1967-09-26 | Ibm | Fluid-actuated translating and printing means |
US3366043A (en) * | 1964-06-18 | 1968-01-30 | Ibm | Fluid pressure-actuated sensing and recording devices |
US3371193A (en) * | 1959-12-31 | 1968-02-27 | Control Data Corp | Automatic card reading system |
US3566082A (en) * | 1966-09-08 | 1971-02-23 | Otto Ramstetter | Device for scanning stationary programming cards |
US3671716A (en) * | 1970-08-24 | 1972-06-20 | Arthur Samuel Slutsky | Method and apparatus of digitizing analog records |
-
0
- DE DENDAT688212D patent/DE688212C/de active Active
-
1931
- 1931-10-02 US US566443A patent/US2072447A/en not_active Expired - Lifetime
-
1932
- 1932-09-30 GB GB27248/32A patent/GB408214A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2838234A (en) * | 1953-07-28 | 1958-06-10 | Zenith Radio Corp | Subscription television code card coupon book |
US2954923A (en) * | 1957-03-27 | 1960-10-04 | Burroughs Corp | Record scanning and decoding apparatus |
US3036764A (en) * | 1958-09-11 | 1962-05-29 | A Kimball Co | Record decoding apparatus |
US3371193A (en) * | 1959-12-31 | 1968-02-27 | Control Data Corp | Automatic card reading system |
US3132241A (en) * | 1960-07-18 | 1964-05-05 | Ibm | Badge-reading apparatus |
US3366043A (en) * | 1964-06-18 | 1968-01-30 | Ibm | Fluid pressure-actuated sensing and recording devices |
US3343481A (en) * | 1965-03-29 | 1967-09-26 | Ibm | Fluid-actuated translating and printing means |
US3566082A (en) * | 1966-09-08 | 1971-02-23 | Otto Ramstetter | Device for scanning stationary programming cards |
US3671716A (en) * | 1970-08-24 | 1972-06-20 | Arthur Samuel Slutsky | Method and apparatus of digitizing analog records |
Also Published As
Publication number | Publication date |
---|---|
GB408214A (en) | 1934-04-03 |
DE688212C (xx) |
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