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Under most use, a bottle opener functions as a second-class lever: the fulcrum is the far end of the bottle opener, placed on the top of the crown, with the output at the near end of the bottle opener, on the crown edge, between the fulcrum and the hand: in these cases, one pushes up on the lever.
Many keychains also offer other functions that the owner wants easily accessible as well. These can include army knives, bottle openers, nail clippers, pill cases, or pepper spray among many others. An electronic key finder is also a useful item found on many keys that will beep when summoned for quick finding when misplaced.
A beverage opener (also known as a multi-opener) is a device used to open beverage cans, plastic bottles or glass bottles, which are the three most common beverage containers. [ 1 ] Types
A home-use opener named the "Bull's head opener" was designed in 1865 and was supplied with cans of pickled beef named "Bully beef". The opener was made of cast iron and had a very similar construction to the Yeates opener, but featured a more artistic shape and was the first move towards improving the look of the can opener.
A ballpoint pen knife is generally a pen with a concealed knife inside, which can be used as a letter opener or as a self-defense weapon. Gravity lock ball bearing pocketknife. Gravity lock ball bearing pocketknife, locks with sphere dropping in and out into grove. Has to be oriented tip up and pressed to release, tip down and pressed to lock.
The Kubotan keychain was originally based on a small bamboo weapon called a "hashi stick", an invention by Kubota's father, Denjiro. Its popularity grew from 1969 to the 1970s when Kubota, at the request of California State Senator Edward M. Davis, the former Chief of the Los Angeles Police Department, created the weapon and began training female officers in its application.
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