Rapid Calculator
|
|
| "Manufacturer:
S.W. Allen Company. 20 South Eighteenth St.,
Philadelphia. The machine is said to have been
manufactured since 1918. Reports of sales in larger
numbers date from 1923. It is a pinwheel machine produced
with either 8 x 9 x 13 places or 9 x 10 x 18 places. It
weighs 4.5 kg." Ernst Martin, "The Calculating
Machines." |
|
Source: Courtesy of Anthony |
