File:US962688-0 Automatic Bell Ringer 1.png: Difference between revisions

Latest revision as of 22:47, 6 April 2014

US Patent 962688 "Automatic bell-ringer" Figure 1.

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current	22:47, 6 April 2014		1,589 × 2,568 (490 KB)	Dnevil (talk \| contribs)	US Patent 962688 "Automatic bell-ringer" Figure 1.

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