LED light illuminates when winding a pendulum, exposed to light or body heat.
ricoh-electronic-devices-company-and-topas-to-attend-electronica-2016-in-munich-8-11-november
Published 7, October 2016 at 500 × 282 in Ricoh Electronic Devices Company and Topas to attend electronica 2016 in Munich, 8-11 November
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