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Using a pocket hole jig also makes for a cleaner and neater appearance as opposed to creating a pocket hole without the help of a jig. [2] A pocket hole jig is generally made of plastic and has a metal insert that the drill bit is inserted through to drill the hole.
In 1957, Oswald Thorsman from Sweden received a patent for a plastic wall plug; around the same time, German inventor Artur Fischer created the plastic Fischer wall plug. [4] [5] The Fischer wall plug, due to its innovative shape, was the first to be suitable for all wall types, and has since been the most produced and sold wall plug worldwide ...
The contract led to the invention and patenting of the world's first wall plug, which became a standard solution for attaching things to walls. [1] John Joseph Rawlings , who is credited with the invention of the wall plug, named his product Rawlplug, using the first syllable of his last name, and renamed his business Rawlplug in 1919.
A bung can be defined as "a plug or closure used to close an opening in a drum or barrel. It is called a plug when referring to a steel drum closure." [1] A glass stopper is often called a "ground glass joint" (or "joint taper"), and a cork stopper is called simply a "cork".
Core plugs are usually thin metal cups press fitted into the casting holes, but may be made of rubber or other materials. The most common metal plugs used in automotive engines are made from plated mild steels, stainless steels, brass or bronze. In some high-performance engines the core plugs are large diameter cast metal threaded pipe plugs. [3]
The MVG Class A of the Munich U-Bahn uses sliding plug doors.. Many passenger trains in the world use sliding plug doors: early examples of passenger trains using plug doors include the MVG Class A of the Munich U-Bahn from 1967, [3] the first batch of trains for Line 2 of the Milan Metro from 1970, [4] and the DT1 of the Nuremberg U-Bahn, also from 1970.
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