Electrotype Printing Block Showing a Manual Hollerith Key Punch

This electrotype printing block is engraved in metal and attached to a wooden block. It shows a manually operated, key-driven Hollerith card punch with 11 keys. Hollerith patented such a machine in 1901, but it had only ten keys, numbered from 0 to 9. The machine shown on the electroplate has these number keys, plus one marked X.
For key punches similar but not identical to that shown, see MA*335634, MA*335635, and MA*333894.
H. Hollerith, "Apparatus for Perforating Record Cards," U.S. Patent 682,197, September 10, 1901.
Currently not on view
Object Name
electrotype printing block
date made
ca 1902
Physical Description
wood (overall material)
metal (overall material)
overall: 2.3 cm x 9.1 cm x 5.4 cm; 29/32 in x 3 19/32 in x 2 1/8 in
ID Number
catalog number
accession number
Computers & Business Machines
Tabulating Equipment
See more items in
Medicine and Science: Mathematics
Tabulating Equipment
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of the Hollerith Family

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