Patent:GB187402879

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Brevetto:GB 187402879
Titolo:Ready Reckoner
Data:21.08.1874
Luogo:Großbritannien
Nazione:Gran Bretagna
Persona:Burkard, A. (P)
Ditta:
Link interni:
Keywords:
Link al brevetto:
(without guarantee)
 GB187402879 (http://v3.espacenet.com/textdoc?DB=EPODOC&F=0&IDX=GB187402879)


"A ready-reckoner or apparatus for obtaining the product of two numbers consists of a flat box, the cover of which is formed with a transverse control slot or row of apertures and with two slots at the bottom. ..."

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Ultima modifica il 11:00, 3. Ott 2013.