External Links
- "Riefler astronomical regulator No. 65,". inventory no. 1998-1-0190a. History of Science Dept., Harvard Univ. Retrieved 2008-05-31. Pictures of 1902 Riefler clock and its parts
- Weinheimer, Peter (2000). "Detailed pictures of parts". Wiederentdeckung und Instandsetzung der Präzisionspendeluhr Riefler Nr. 711 (Rediscovery and repair of Riefler No. 711). radiophil.com. Retrieved 2008-05-31.
- "Clemens Riefler regulator, 1929". Precision Regulator Clocks Gallery, National Watch and Clock Museum. NAWCC (National Association of Watch and Clock Collectors). 2007. Retrieved 2008-06-02. Closeups of 3 Riefler clocks and some technical information
- "About Us". Riefler Industries, GmBH. 2007. Retrieved 2008-06-02. Present day Riefler Co., does not make clocks
Read more about this topic: Riefler Escapement
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