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comparative display of old cam with IBM ASCC-Mark I cam

International Business Machines Corporation

1930-1937

comparative display of relays for Harvard Mark I-IV computers

Harvard Computation Laboratory

1944-1952

comparative display of standard counters and later IBM ASCC-Mark I counters

International Business Machines Corporation

1929-1938

comparative display of standard wire contacts and later IBM ASCC-Mark I contacts

International Business Machines Corporation

1929-1938

Dayton balance scale,with glass tray

International Business Machines Corporation

late 19th-early 20th Century

floating-point arithmetic computer chip

International Business Machines Corporation

1982

floating-point arithmetic computer chip

International Business Machines Corporation

1981-1985

floppy disk drive

International Business Machines Corporation

circa 1982

harmonic analyzer

Zdenek Trnka

1947

Harvard Mark II final models of relays

Harvard Computation Laboratory

1947

Harvard Mark IV memory register, word "111"

Harvard Computation Laboratory

1949-1950

IBM ASCC-Harvard Mark I photo album

International Business Machines Corporation

1944

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comparative display of old cam with IBM ASCC-Mark I cam

comparative display of relays for Harvard Mark I-IV computers

comparative display of standard counters and later IBM ASCC-Mark I counters

comparative display of standard wire contacts and later IBM ASCC-Mark I contacts

Dayton balance scale,with glass tray

floating-point arithmetic computer chip

floating-point arithmetic computer chip

floppy disk drive

harmonic analyzer

Harvard Mark II final models of relays

Harvard Mark IV memory register, word "111"

IBM ASCC-Harvard Mark I photo album