词语大全 safety pinion造句 safety pinionの例文 "safety pinion"是什么意思

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词语大全 safety pinion造句 safety pinionの例文 "safety pinion"是什么意思

safety pinion造句 safety pinionの例文 "safety pinion"是什么意思  以下文字资料是由(本站网www.lishixinzhi.com)小编为大家搜集整理后发布的内容,让我们赶快一起来看一下吧!

The movements featured Gruen\'s 1874 safety pinion design.

A " safety pinion " was an alternate means of protection, used with the going barrel.

Later he worked for three years in Switzerland before going to the U . S . A . In 1874 he took out a patent for a safety pinion ( U . S . patent no 157 913 ) for pocket watches, which prevented damage to the watch movement if the watch\'s mainspring broke.

It\'s difficult to find safety pinion in a sentence. 用safety pinion造句挺难的

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