References |
The Horological Journal, 1963-239 |
Prof. Werner Flury, Die industrielle Entwicklung des Kantons Solothurn, 1907 |
La Fèdèration Horlogèrie - Suisse, 1905-1910 |
Roamer Journal 1951, 1953. |
US Patent and Trademark office - digital archive |
The UK IPO - digital archive |
Escapenet - EU patent database |
Period advertising from the Roamer Watch Company - from a number of published sources. |
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