File:US962688-0 Automatic Bell Ringer 2.png
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![File:US962688-0 Automatic Bell Ringer 2.png](/mediawiki/images/thumb/1/11/US962688-0_Automatic_Bell_Ringer_2.png/376px-US962688-0_Automatic_Bell_Ringer_2.png?20140407035532)
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US Patent 962688 "Automatic bell-ringer" Figure 2.
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current | 22:55, 6 April 2014 | ![]() | 1,606 × 2,558 (363 KB) | Dnevil (talk | contribs) | US Patent 962688 "Automatic bell-ringer" Figure 2. |
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