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Keyless Watches

M. Grossmann
1882 Scientific American  

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doi:10.1038/scientificamerican04291882-5259bsupp fatcat:v32y7tpkpfb4dcmceg4yibdkh4
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M. Grossmann. "Keyless Watches." Scientific American 13.330supp (1882) 5259-5260