File:US962688-0 Automatic Bell Ringer 1.png
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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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