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The kit also includes a precision spring scale to kids can measure how the machines work. Everything is clearly laid out in a full-color 32-page book so kids can go at their own pace. Plus, you ...
A safety pin. A ribbon and badge attached to a school cap with safety pins. A safety pin is a variation of the regular pin which includes a simple spring mechanism and a clasp. . The clasp forms a closed loop to properly fasten the pin to whatever it is applied to and covers the end of the pin to protect the user from the sharp poi
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This simple design, with a unilateral spring, looks remarkably like a modern safety pin. The violin bow fibula has a low flat arch; the body runs parallel to the pin so it resembles a violin bow. The bow could be round, square, or flat and ribbon-like in cross-section. Some had simple punched or incised decoration on the bow.
A Roskopf, pin-lever, or pin-pallet escapement is an inexpensive, less accurate version of the lever escapement, used in mechanical alarm clocks, kitchen timers, mantel clocks and, until the 1970s, cheap watches now known as pin lever watches. It was popularized by German watchmaker Georges Frederic Roskopf in its "proletarian watch" from 1867 ...
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Engraved on the handle of the hatchet, the pin reads, "Death to Rum". [2] Gold or silver style safety pins were commonly used as tie and collar pins from the beginning of the 20th century. Such a safety pin was used to fasten the tie to the shirt and was an integral part of a man's clothing or school uniform, being especially useful on formal ...