Hollerith 45 column horizontal electrical sorting machine, 1920-1930
1920-1930
80-column hand-punch by British Tabulating Machine Co. Ltd
Punched Card Reproducer, Model 202
1955
Universal Plug Board Gauge
1945
BTM 80 col Gang Punch Die and Stripper
1937
BTM Card Sensing Unit (from Duplicator)
1920
BTM Numerical Print Unit, c.1937
1937
BTM Geneva Mechanism used on 200 series Reproducer High Speed Card Punch
1937
Hollerith key punch, model 20, 1909-1932
1909-1932
Hand operated Mercury cup tabulator
1908
Output print unit
1953
Data storage drum
1960
Automatic Non-Printing Tabulator
1923
Selection of BTM Relays, on display panel
BTM Paper Feed Unit (used on 800 series Tabulators)
1946
Part of BTM Hollerith Plug-board Assembly
1945
Half adder from Type 555 Hollerith Electronic Calculator
1957
Hand gang punch
1904
Card feed unit
1953
Card Verifier
circa 1950
BTM vertical sorter, 1911.
1911
Non-printing balancing tabulator
Automatic non-printing tabulator
1923
Hollerith 80 col. replicating punch
BTM-Hollerith Wire Relay Gate
1948
BTM-Hollerith Relay Gate
1945
BTM Collator Selector Unit
1946
BTM/Hollerith Upper Counter Commutator, c.1939
1939
BTM type 589 Output Print Unit, Magnet Box
Accessories for Automatic non-printing tabulator
1923
Part of BTM Hollerith Plug-board Assembly
1945
BTM vertical sorter, 1911.
1911
Non-printing balancing tabulator
Covers for BTM Printer and Lister
BTM Hollerith Plug-board Assy, c.1945
1945
80 Col Sorter/counter
circa 1950
BTM 800 series Alpha Wheel
BTM Rule for measuring number of cards in a pile
BTM Hollerith 800 series Print Mechanism
BTM Model of Experimental Geneva Mechanism
1955
BTM Universal Carriage Unit (used on 800 series Tabulators)
1946
BTM type 589 Output Print Unit, Magnet Box
80 Col. Collator
Non-printing balancing tabulator
Collection of early punched cards used by Hollerith and BTM
Card interpreter
1959
Card enterpreter
1959
Card interpreter
1959
Base of BTM vertical sorter, 1911.
1911
Hollerith card punch
1950-1965