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Most office supply stores have staples for an Ace Liner model 502 stapler. Many lumber yards and home repair stores will also have them available.
i tapped mine lightly with a hammer and the top portion popped out and was able to open it up.
After I searched this topic for our Vintage Ace Liner 502 stapler, I found they take standard staples but not the usual standard staples. These are Ace standard staples. I haven't bought them yet, but in looking at all the vintage Ace 502 staplers for sale the recommendation is standard staples, so it must mean their companies standard staples.
Push the bottom plate forward with your thumb so the inward flared staple holes line up with the upper edge of the stapler. That lopsided square place on the bottom of the stapler just slides forwared and backward about a quarter of an inch.
Impossible to answer without knowing the model.
1987
20% of 502 = 20% * 502 = 0.2 * 502 = 100.4
The factors of 502 are: 1, 2, 251, 502.
12% of 502 = 502*12/100 = 60.24
502 is a Composite Number
502 = DII
Roman numeral 502 is represented as "DII" in Roman numerals.