When we had our home office window replaced, I noticed the odd-looking nail you see below, which held the old window in place. At first, I thought it was just the type of nail they used back in the 1950s when the house was built. But after a fair amount of searching, I find that it's a masonry nail. They are designed to attach materials to hard surfaces like brick, concrete, or stone (in our case, brick). More information on these tough guys can be found at the following link.
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