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1939 Press Photo This is spool developed by Westinghouse research engineers to

1939 Press Photo This is spool developed by Westinghouse research engineers to

protect transformers against their own internal electrical failures

Photo is dated 1939.

Photo measures 8 x 10.25 inches.
$7.00

Original: $19.99

-65%
1939 Press Photo This is spool developed by Westinghouse research engineers to—

$19.99

$7.00
Product image 1
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Description

protect transformers against their own internal electrical failures

Photo is dated 1939.

Photo measures 8 x 10.25 inches.

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