Heliowatt Polyphase meter EM8a*
By Steffen Froeschle; posted February 24, 2018
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Heliowatt polyphase meter EM8a* from 1957 making only 187,5 rev. per kWh. |
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Heliowatt polyphase meter EM8a* from 1957 making only 187,5 rev. per kWh. |