![]() Google Patents Electric memory latch device for piano having electric chord and run playing mechanismÄownload PDF Info Publication number US3160049A US3160049A US87026A US8702661A US3160049A US 3160049 A US3160049 A US 3160049A US 87026 A US87026 A US 87026A US 8702661 A US8702661 A US 8702661A US 3160049 A US3160049 A US 3160049A Authority US United States Prior art keywords playing switch piano octave note Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. ![]() ![]() Google Patents US3160049A - Electric memory latch device for piano having electric chord and run playing mechanism US3160049A - Electric memory latch device for piano having electric chord and run playing mechanism
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