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US1956350A Electrical Musical Instrument (1934-01-19 filed, 1934-04-24 published) by Laurens Hammond - Hammond Organ.pdf - Clusternote

JP patent 108664, Electric Musical Instrument. by Sei-ichi Yamashita, assigned to Yamaha (1934-03-15 filed, 1934-08-01 published, 1934-11-28 granted) - Magna Organ patent 1-1.pdf - Clusternote

JP patent 110068, Electric Musical Instrument. by Sei-ichi Yamashita, assigned to Yamaha (1934-05-09 filed, 1934-11-19 published, 1935-03-26 granted) - Magna Organ patent 1-2.pdf - Clusternote

JP patent 111216, Electric Musical Instrument. by Sei-ichi Yamashita, assigned to Yamaha (1934-10-01 filed, 1935-03-11 published, 1935-06-19 granted) - Magna Organ patent 1-3.pdf - Clusternote