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Sensitive Hair Element

1941

Aircraft temperature

1939

Carrying case

1939

Carrying case

1941

Aircraft temperature

1941
Component, for Aircraft temperature, humidity and pressure recorder, by Julian P. Friez & Sons Inc, Baltimore, Maryland, United States of America, 1939

Component, for Aircraft temperature

1939
Aircraft temperature, humidity & pressure recorder, sensitive hair element, in tin-lidded topped glass tube, and carrying case, with three glass bottles secured under case lid, by Julian P. Friez & Sons Inc, Baltimore, Maryland, United States of America, 1941

Aircraft temperature