| 1920 FRANK ZAMECNIK Musical Instrument Patent |
| 1920 KELLUM ORLANDO Musical Instrument Patent |
| 1920 FRANK Musical Wind Instrument Patent Print |
| 1920 HOYT Portable Measuring Instrument Patent 30201 |
| 1920 THOMAS Automobile Instrument Board Patent |
| 1920 HELLER HENRY Musical Instrument Patent |
| 1920 SNYDER Drawing Instrument Design Patent 30203 |
| 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 WELLS WESLEY Track Instrument Patent Print |
| 1920 ALBERT MORRIS Musical Instrument Patent |
| 1920 GULICK Wind Music Instrument Key Patent 17218 |
| 1920 ROLAND CHARLES Musical Instrument Patent |
| 1920 REAMS Stringed Musical Instrument Patent |
| 1920 LEWIS Musical Stringed Instrument Patent |
| 1920 WHITE Design Instrument Dial FAYETTE Patent 49629 |
| 1920 EDMOND MUELLER Musical Instrument Patent |
| 1920 COSSMAS Stringed Musical Instrument Patent |