Flip clock (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Flip clock" in English language version.

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Pallweber, Josef (27 October 1890). "Pallweber Patent" (PDF). Flip Clock Fans. Imperial Patent Office. Archived (PDF) from the original on 2025-03-12. Retrieved 2025-03-12.
Terwilliger, Charles O. (1964). "Eugene L. Fitch and The Plato Clock" (PDF). Flip Clock Fans. National Association of Watch and Clock Collectors. Retrieved 2025-03-12.

"Fachblatt für Uhrmacher XIV Jahrgang". Berlin: Deutsche Uhrmacher Zeitung. December 1, 1890. pp. 178–179. Archived from the original on 2022-08-10. Retrieved 2025-03-12.

Pallweber, Josef (27 October 1890). "Pallweber Patent" (PDF). Flip Clock Fans. Imperial Patent Office. Archived (PDF) from the original on 2025-03-12. Retrieved 2025-03-12.
"Fachblatt für Uhrmacher XIV Jahrgang". Berlin: Deutsche Uhrmacher Zeitung. December 1, 1890. pp. 178–179. Archived from the original on 2022-08-10. Retrieved 2025-03-12.
"Adix Adding Machine Explained – Everything You Need To Know". History Computer. Archived from the original on 2023-11-28. Retrieved 2025-03-12.