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Bismar with spirit-level, to indicate the balance point, with box

Bismar with spirit-level, to indicate the balance point, with box

1982
Slide rule with single slider and cursor for traffic flow calculations

Slide rule with single slider and cursor for traffic flow calculations

2 samples of white Perlon parachute fabric .

2 samples of white Perlon parachute fabric .

Slide rule with single slider and cursor for traffic flow calculations by Nestler for Westfalisches Versandhaus, Bielefeld, Germany, in cardboard case with typewritten French instruction sheet

Slide rule with single slider and cursor for traffic flow calculations by Nestler for Westfalisches Versandhaus