| 1942 JOEL Player Attachment For Pianos Patent |
| 1926 PEDER Banjo Attachment For Pianos Patent |
| 1927 BETZ Mandolin Attachment For Pianos Patent |
| 1890 VILBISS Keyboard Attachment Pianos Patent 21262 |
| 1920 GRAHAM Optical Attachment Player Pianos Art |
| 1926 MAX Mandolin Attachment For Pianos Patent |
| 1921 BATES Attachment For Player Pianos Patent |
| 1922 JOHNSON Mandolin Attachment Pianos Art |
| 1920 KUMMETH Pedal Chord Player Attachment Pianos |
| 1924 DAVID Damper Attachment For Pianos Patent |
| 1926 NELSON WIGGEN PIANO Banjo Attachment Pianos |
| 1935 WILSON Foot Operable Playing Attachment Pianos |
| 1922 HENRY Cleaner Attachment Player Pianos Art |
| 1927 STRAUBE PIANO Mandolin Attachment Pianos |
| 1924 ORESTE Mandolin Attachment Player Pianos |
| 1921 GEORGES Mandolin Attachment Pianos Art |
| 1928 WHITE Adjustable Player Attachment Pianos |
| 1928 SIMPLEX Adjustable Player Attachment Pianos |
| 1931 GIZINSKY Attachment For Pianos Patent Print |
| 1921 FRANK Plectrum Attachment For Pianos Patent |