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Frequency Range:  ?
Nameplate information:

MARCONI' / WAVEMETER / TYPE M.P.7 P.S. NO 3387 A / INST. NO 368223 MARCONI'S WIRELESS / TELEGRAPH CO. LTD. / LONDON"
 

Various views of the MP-7 wavemeter

Images courtesy History and Science Museum, London.

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Contributors and Credits:

1 )http://www.mhs.ox.ac.uk/collections/imu-search-page/record-details/?TitInventoryNo=49422&querytype=field&thumbnails=on
 
 

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May 23/21