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Patent
Suchergebnisse für: Thornton
- Patent:GB411090 29.05.1934 Boardman, Hubert (P) A.G. Thornton (P) : Improvements in Slide Rule Calculators
- Patent:GB468257 01.07.1937 Boardman, Hubert (P) & Clayton, Albert Edmund (P) & Naylor, Felix Samuel (P) Thornton (P) Ltd : Improvements in Slide Rule calculators, other scale devices, and direction drawing instruments