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BJ (bamaj1) posted an update Monday, Nov 14, 2011, 5:37pm EST, 14 years, 2 months ago
Hi xyste - Normally that question is asked the other way around, as in when did Phillips head screws (+) come into general use. That was in the 1930's. If your piece has slotted screws that appear original, the item is probably older than that.