| 1920 RUDOLPH Double Tracker Musical Instrument |
| 1920 STODDARD Automatic Musical Instrument Art |
| 1920 FRANK ZAMECNIK Musical Instrument Patent |
| 1920 KELLUM ORLANDO Musical Instrument Patent |
| 1920 MADSEN Double Tracker Musical Instrument |
| 1920 FRANK Musical Wind Instrument Patent Print |
| 1920 GIBSON Stringed Musical Instrument Art |
| 1920 HELLER HENRY Musical Instrument Patent |
| 1920 ENRICO Stringed Musical Instrument Patent |
| 1920 JOHN WEBER Musical Instrument Patent Print |
| 1920 KENT REESE Musical Instrument Patent Print |
| 1920 KREGLING Design Musical Instrument Patent 25469 |
| 1920 AUTO PNEUMATIC ACTION CO Musical Instrument |
| 1920 ALNUTT Musical Instrument String Retoner |
| 1920 ALBERT MORRIS Musical Instrument Patent |
| 1920 AMERICAN PIANO Automatic Musical Instrument |
| 1920 ROLAND CHARLES Musical Instrument Patent |
| 1920 REAMS Stringed Musical Instrument Patent |
| 1920 LEWIS Musical Stringed Instrument Patent |
| 1920 EDMOND MUELLER Musical Instrument Patent |
| 1920 COSSMAS Stringed Musical Instrument Patent |