1

A Method of Ruling Equidistant Parallel Lines

Year:
1945
Language:
english
File:
PDF, 550 KB
english, 1945
2

Wire Models of Prisms

Year:
1946
Language:
english
File:
PDF, 583 KB
english, 1946
3

An Alternating Current Diaphragm Pump

Year:
1945
Language:
english
File:
PDF, 385 KB
english, 1945