Found 2 records, showing 1 of 1 pages
1942:
Aircraft Computers & Calculators
Aircraft Computers & Calculators. Spot Circular Slide Rule
Rec. Num. 1 of 2
Source: Aeroplane May 8th 1942
1942:
Aircraft Computers & Calculators
Aircraft Computers & Calculators. Spot Circular Slide Rule
Rec. Num. 2 of 2
Source: Aeroplane June 19th 1942
