| 1931 BURKLE Wind Musical Instrument Patent Print |
| 1931 ZIMMERMAN Musical Instrument PATENTS Patent 25519 |
| 1931 LOGAN Musical Wind Instrument Patent Print |
| 1931 SCHERR Automatic Musical Instrument Patent |
| 1931 SHERMAN Stringed Musical Instrument Patent |
| 1931 MORIZ STOEHR Music Instrument Patent Print |
| 1931 RICHARD Stringed Musical Instrument Patent |
| 1931 LOMAN JR Musical Instrument Patent Print |
| 1931 DANTE Stringed Musical Instrument Patent |
| 1931 CHARLES Stringed Musical Instrument Patent |
| 1931 PAULO Stringed Musical Instrument Patent |
| 1931 ZIMMERMAN Instrument Casing PULLEN Patent 25518 |
| 1931 VICTOR Musical Instrument Player Patent |
| 1931 BIOLCATI Saxophone Musical Instrument Patent 17290 |
| 1931 CONN LTD C G Wind Musical Instrument Patent |
| 1931 RUDOLPH Stringed Musical Instrument Patent |
| 1931 MINTEER Musical Instrument Patent Print Art |
| 1931 HERMANN String Musical Instrument Patent |
| 1931 HAMMANN Wind Musical Instrument Pad Patent |
| 1931 KAUFMAN Stringed Musical Instrument Patent |
| 1931 EXTER Piano Teaching Instrument Patent |
| 1931 ANDREA Multiple Gymnastic Instrument Patent |
| 1931 KERR Musical Instrument Key Spatule Patent 17295 |
| 1931 ABENDROTH Track Instrument Patent Print Art |
| 1931 GEN ELECTRIC Musical Instrument Patent |
| 1931 HARRY BERNARD Wind Instrument Patent Print |
| 1931 ZIMMERMAN Musical Instrument Patent Print |
| 1931 HAMMANN Wind Musical Instrument Pad Patent 17293 |
| 1931 MILETTE Wind Musical Instrument Patent |
| 1931 LARGE Stringed Musical Instrument Patent |
| 1931 PULLEN Design Music Instrument PATENT Patent 25516 |
| 1931 EUGENE Electric Musical Instrument Patent |
| 1931 ARTHUR S HICKOK Sound Instrument Patent |
| 1931 WILLIAM Combined Musical Instrument Patent |
| 1931 SWANSON Musical Instrument Patent Print Art |
| 1931 HIGGINBOTHAM Musical Instrument Patent |
| 1931 FRANK NARDONE Musical Instrument Patent |
| 1931 WHEATLEY Stringed Musical Instrument Patent |
| 1931 CALVANI Saxophone Musical Instrument Patent 17291 |
| 1931 BERNARD Musical Wind Instrument Patent 17289 |
| 1931 ROY BANKS Musical Instrument Patent Print |
| 1931 KORTEPETER Battle Order Instrument Patent |
| 1931 HARRY Musical Wind Instrument Patent Print |
| 1931 MANN BRADY Musical Instrument Patent Print |
| 1931 OSBORNE Musical Instrument Patent Print Art |
| 1931 PECHADRE Wave Operated Instrument Patent 21274 |
| 1931 MYERS HUBERT Sound Instrument Patent Print |
| 1931 ANTONIO Acoustic Instrument Patent Print |
| 1931 BERRY Stringed Musical Instrument Patent |