-
BJ (bamaj1) posted an update Monday, Nov 14, 2011, 6:37pm EST, 12 years, 6 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.