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Drawing pin
A thumb tack (North American English) or push pin is a short nail or pin used to fasten items to a wall or board for display and intended to be inserted by hand, generally without the assistance of tools. A variety of names are used to refer to different designs intended for various purpose. Thumb tack and push pin are both sometimes compounded (thumbtack or pushpin) or hyphenated (thumb-tack or push-pin). Thumb tacks made of brass, tin or iron may be referred to as brass tacks, brass pins, tin tacks or iron tacks, respectively.〔(【引用サイトリンク】url=http://www.oed.com/view/Entry/22729#eid14908084 )〕 These terms are particularly used in the idiomatic expression ''to come'' (or ''get'') ''down to brass'' (or otherwise) ''tacks'', meaning to consider basic facts of a situation.〔(【引用サイトリンク】url=http://www.oed.com/view/Entry/22729#eid14908084 )〕 ''Drawing pin'' or drawing-pin refers to thumb tacks used to hold drawings on drawing boards. Map pin or map tack refers to thumb tacks used to mark locations on a map and to hold the map in place.
==History==
Edwin Moore invented the "push-pin" in 1900 and founded the Moore Push-Pin Company. Moore described the push-pin as a pin with a handle. Later, in 1904, in Lychen, German clockmaker Johann Kirsten invented flat-headed thumb tacks for use with drawings.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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