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Possible Answers:
Padlocks.
Last seen on: Daily Celebrity Crossword – 1/2/19 Wayback Wednesday
Random information on the term “Padlocks”:
The pin tumbler lock is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key. Pin tumblers are most commonly employed in cylinder locks, but may also be found in tubular pin tumbler locks (also known as radial locks or ace locks).
The first tumbler lock was found in the ruins of the Palace of Khorsabad in Iraq.[1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door, and a horizontal bolt that slid into the post. The bolt had vertical openings into which a set of pins fitted. These could be lifted, using a key, to a sufficient height to allow the bolt to move and unlock the door.[2] This wooden lock was one of Egypt’s major developments in domestic architecture during classical times.[1]
Such a lock, however, may be defeated by lifting the pins uniformly beyond the unlatching point. In 1805, the earliest patent for a double-acting pin tumbler lock — one where lifting the pins too much or too little prevented opening — was granted to American physician Abraham O. Stansbury in England. It was based on earlier Egyptian locks and Joseph Bramah’s tubular pin tumbler lock. Two years later, Stansbury was granted a patent in the United States for his lock.[3]