| 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 WILLIAM W VARNEY Wind Musical Instrument Pad |
| 1931 OSCAR SCHMIDT INC Stringed Musical Instrument |
| 1931 ROBERT Wave Operated Musical Instrument Art |
| 1931 LOCKWOOD Automatic Musical Instrument Art |
| 1931 RICHARD Stringed Musical Instrument Patent |
| 1931 AMERICAN PIANO CORP Automatic Musical Instrument |
| 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 RUDOLPH WURLITZER Automatic Musical Instrument |
| 1931 STODDARD Automatic Musical Instrument Art |
| 1931 MALCOLM Musical Instrument Key Busher Art |
| 1931 VICTOR Musical Instrument Player Patent |
| 1931 SAMUEL M STONE Stringed Musical Instrument |
| 1931 FRANK Plucked String Musical Instrument Art |
| 1931 BIOLCATI Saxophone Musical Instrument Patent 17290 |
| 1931 CONN LTD C G Wind Musical Instrument Patent |
| 1931 JORG Electro Acoustic Musical Instrument |
| 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 KERR Musical Instrument Key Spatule Patent 17295 |
| 1931 WILLIAMS Musical Instrument String Securing |
| 1931 GEN ELECTRIC Musical Instrument Patent |
| 1931 JOHN HALMAGYI Electrical Musical Instrument |
| 1931 GLADSTONE Percussion Musical Instrument Art |
| 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 VIOLET Keyboard Operated Musical Instrument |
| 1931 EUGENE Electric Musical Instrument Patent |
| 1931 GEORGE RAMSEY Stringed Musical Instrument |
| 1931 AEOLIAN Automatic Musical Instrument Art |
| 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 REGAL Plucked String Musical Instrument Art |
| 1931 ARTLEY Oboe Similar Musical Instrument Art |
| 1931 CALVANI Saxophone Musical Instrument Patent 17291 |
| 1931 INTERNAT MUSICAL CORP Stringed Musical Instrument |
| 1931 BERNARD Musical Wind Instrument Patent 17289 |
| 1931 ROY BANKS Musical Instrument Patent Print |
| 1931 HARRY Musical Wind Instrument Patent Print |
| 1931 NICHOLAS Electrical Musical Instrument Art |
| 1931 MANN BRADY Musical Instrument Patent Print |
| 1931 OSBORNE Musical Instrument Patent Print Art |
| 1931 INTERNAT PATENTS CORP Musical Instrument |
| 1931 BEAUCHAMP Stringed Musical Instrument Art |
| 1931 BERRY Stringed Musical Instrument Patent |