| Country of Origin | United States |
|---|---|
| Brand | Doubleday-Hill Electric |
| Time Period Manufactured | Pre-1930 |
Check the listing for details. 1917 DOUBLEDAY-HILL ELECTRIC NAVY TYPE LOOSE COUPLER RECEIVING TRANSFORMER. Condition: Used, Made in United States. Listed at 575.00 USD. They had moved to a new 5-story building in Pittsburgh in 1903. In the April issue of QST, they ran an ad for a rotary spark gap.
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