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Joe,

For your collection of photos of old electrical parts.

I came across this American-made knife switch in a box of old radio parts in somebody's barn. The switch is only a small one, about 2.5" length on the porcelain base. The top carries the name "Trumbull" and, presumably, their trade mark - a "T" in a circle. I don't know if this company was well-known in the States or not.

The only other markings, other than "Made in U.S.A." are "707", which I take to be a part number and "12-21," possibly a date of manufacture???

Best wishes,
Paul.

Joe Tedesco, NEC Consultant