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A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves). A hole punch can also refer to similar tools for other materials, such as leather, cloth, or sheets ...
On 17 August 1888, the Swedish inventor Johan Petter Johansson (1853-1943) took out his first patent on the adjustable pipe wrench. [3] The Swedish Patent Office issued the patent again in 1894. [4] The idea emerged after he established his company Enköpings Mekaniska Verkstad. Back then, nut dimensions were poorly standardized, so each time a ...
It is a thin, tapered metal shaft, coming to a sharp point, either straight or slightly bent. These shafts are often in the form of interchangeable needles. They usually have an eye piercing at the pointed end to aid in drawing thread through holes for the purpose of manual lockstitch sewing, in which case it is also called a sewing awl ...
The four-hole version has no ISO standard [citation needed]. The distances between holes are 80 millimetres (3.1 in) (3 × 8). The most common type in Canada and the United States is a three-ring system for letter size pages (8 + 1 ⁄ 2 by 11 inches or 220 mm × 280 mm
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The most common shapes are called open-ended spanner and ring spanner. The term wrench is generally used for tools that turn non-fastening devices (e.g. tap wrench and pipe wrench), or may be used for a monkey wrench—an adjustable pipe wrench. [1] In North American English, wrench is the standard term.