An pagkakaiba han mga rebisyon han "Relo"
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Bagis 34:
* [http://www.nawcc.org National Association of Watch & Clock Collectors Museum]
* [http://www.ieee-uffc.org/main/history.asp?file=marrison Article, by a key figure in the development of quartz crystal clocks, on the history of timekeeping up to the late 1940s from ''The Bell System Technical Journal, Vol. XXVII, pp. 510-588, 1948''] {{Webarchive|url=https://web.archive.org/web/20110717061023/http://www.ieee-uffc.org/main/history.asp?file=marrison |date=2011-07-17 }}
* [http://www.Timeforclocks.nl Information on Dutch clocks] {{Webarchive|url=https://web.archive.org/web/20201123185322/http://timeforclocks.nl/ |date=2020-11-23 }}
* [http://www.blackforestclocks.org Information on Black Forest Horology] {{Webarchive|url=https://web.archive.org/web/20100330040942/http://www.blackforestclocks.org/ |date=2010-03-30 }}
* [http://www.sciencemuseum.org.uk/visitmuseum/galleries/time_measurement.aspx Science Museum - Time Measurement] {{Webarchive|url=https://web.archive.org/web/20100620223018/http://www.sciencemuseum.org.uk/visitmuseum/galleries/time_measurement.aspx |date=2010-06-20 }}
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