Timekeeping List of Japanese inventions and discoveries

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a seiko quartz wristwatch using chronograph function (movement 7t92).



automatic quartz
the first watch combine self-winding crystal oscillator timekeeping unveiled seiko in 1986.


myriad year clock
the myriad year clock (万年自鳴鐘 mannen jimeishou, lit. ten-thousand year self-ringing bell), universal clock designed japanese inventor hisashige tanaka in 1851. belongs category of japanese clocks called wadokei.


quartz wristwatch
the world s first quartz wristwatch revealed in 1967: prototype of astron revealed seiko in japan, in development since 1958. released public in 1969.


spring drive
a watch movement first conceived yoshikazu akahane working seiko in 1977 , patented in 1982. features true continuously sweeping second hand, rather traditional beats per time unit, seen traditional mechanical , quartz watches.




^ seiko kinetic. 20 years of success (press release). seiko. 2007-04-12. retrieved 2014-11-11. 
^ challenge of myriad year clock (万年時計の謎に挑む), tv program (in japanese) broadcast on 23 april 2005, japan broadcasting corp. retrieved on 2009-02-05.
^ electronic quartz wristwatch, 1969 . ieee history center. retrieved 2007-08-31. 
^ http://global.epson.com/company/corporate_history/milestone_products/pdf/35_spring-drive.pdf






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