1888 - 1934
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DE043463C
May 21, 1888
Rechentafel (calculating board)
Julius Billeter
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DE071715C
Nov 9, 1893
Rechenwalze (Computing Roller)
Julius Billeter
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DE102599C
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DE104869C
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DE132347C
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DE150179C
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DE158452C
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DE163933C
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DE163935C
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DE164814C
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DE171698C
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DE173660C
July 27, 1906
Rechenstab
Albert Nestler
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DE206428A
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DE215722
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DE365637C1
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DE450304C1
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DE559664C1
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DE574594
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DE596286
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1938 -
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DE625535
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DE655353
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DE684135
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DE7338885U
July 2, 1974
Logarithmische Rechenvorrichtung Schreibgerät (calculating pencil)
Karl Opdenhövel
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DE804932
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DE821840
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DE873455
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DE873456
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DE1018659
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DE1062040
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DE1067622B
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DE1115967
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DE1170170
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DE1289083
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DE1314631
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DE1348341
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DE1354648
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1942 - 1998
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DE1394384
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DE1400134
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DE1484667
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DE1486119
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DE1506113
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DE1606805U
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DE1711381U
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DE1711381U
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DE1758396A1
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DE1794100U
Rechenstift
21 Mar 1959
Dennert & Pape, Aristo Werks.
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DE1941665
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DE2043176
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DE2233134
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DE3148355A1
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DE1941665A1
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DE19531041
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DE19601272
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DE19701250A1
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