1952, An electronic humidity indicator used at Philadelphia Arsenal - Historic Images

SKU: mjc07536

1952 Press Photo An electronic humidity indicator used at Philadelphia Arsenal

mjc
$19.99
$19.99
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Photo measures 7 x 9.25 in. Photo is dated 11/21/1952.

Inventions - New Moisture Spotter - Philadelphia, Pennsylvania: A new electronic humidity indicator, capable of detecting a spoonful of water in an av



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