Bottle opener capacity. A specific style of bottle opener is known as a churchkey. Invented at the same time as the crown cork, it is the original bottle opener. But as well as being portable it also comes as a fixed device to be attached to vertical surfaces, often with a tray to catch the bottle tops. It does not open wine bottles. It is class 2 fulcrum type. A simple opener is a piece of metal with a rectangular or rounded opening in one end and a solid handle large enough to be gripped between the thumb and forefingers on the
P-38 can opener the slot. Hold between thumb and forefinger and twist forward to puncture. Repeat motion until can is open. It takes approximately 38 punctures to fully open a C-ration can. Their design is similar, but not identical, to the P-38 and P-51 can openers. The Swedish army also employed a similar variant of this opener. Its official designation is M7481-021000 "Konservbrytare Mini" which was distributed with the notorious "Golden Cans" (Swedish field rations were packaged in metallic tins with a golden hue). In 1924, a similar device was featured in "Popular Mechanics", with no mention of a military provenance. An opener