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Publication numberUS2651457 A
Publication typeGrant
Publication dateSep 8, 1953
Filing dateMay 13, 1949
Priority dateMay 13, 1949
Publication numberUS 2651457 A, US 2651457A, US-A-2651457, US2651457 A, US2651457A
InventorsJohnson Richard L, Luhn Hans P
Original AssigneeIbm
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Calculating machine
US 2651457 A
Abstract  available in
Images(48)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

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Filed May 13, 1949 i 48 Sheets-Sheet 2O SHIFT 4 ATTORNEY

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1902035 *Feb 29, 1928Mar 21, 1933Tabulating Machine CoTransfer mechanism
US2178064 *Jul 12, 1932Oct 31, 1939IbmSliding scale multiplying machine
US2202235 *Sep 12, 1938May 28, 1940Smith Webster DAir cooler and/or humidifier
US2302001 *Feb 11, 1941Nov 17, 1942IbmTens carry mechanism for totalizers
US2364758 *Oct 25, 1938Dec 12, 1944Remington Rand IncRecording and computing machine
US2403005 *Nov 24, 1939Jul 2, 1946IbmTypewriting calculating machine
US2419502 *Feb 16, 1944Apr 22, 1947Ncr CoMultiplying machine
US2486809 *Sep 29, 1945Nov 1, 1949Bell Telephone Labor IncBiquinary system calculator
US2536951 *Dec 21, 1945Jan 2, 1951IbmRecord controlled multiplying machine
GB600896A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4198684 *Oct 31, 1976Apr 15, 1980Hewlett-Packard CompanyElectronic calculator with keyboard-controlled unary function capability
US4674039 *Oct 9, 1984Jun 16, 1987Chouery Farid AMethod for determining whether a given value is included in an ordered table of values stored in a computer readable memory
Classifications
U.S. Classification708/440, 708/441
International ClassificationG06F7/46
Cooperative ClassificationG06F7/468
European ClassificationG06F7/46C