| 1921 WINTERHOFF Wind Instrument Socket Patent 17220 |
| 1921 MAXWELL Musical Instrument Patent Print Art |
| 1921 STARR PIANO Musical Instrument Art Print |
| 1921 PLATE Bridge String Music Instrument Patent 25476 |
| 1921 HARRINGTON Stringed Musical Instrument Art |
| 1921 HUSTED Firing Instrument Marine Mines Art |
| 1921 LEE Window Instrument Dial NORTH Patent 24422 |
| 1921 BUESCHER Musical Instrument Key Pad Patent 17219 |
| 1921 SURRATT Stringed Musical Instrument Patent |
| 1921 SCHERR Automatic Musical Instrument Music Sheet |
| 1921 FRITZ Stringed Musical Instrument Patent |
| 1921 HATCH Bull Holding Instrument Patent Print |
| 1921 TOWER Mechanical Musical Instrument Patent |
| 1921 JOHN D CALLAHAN Stringed Musical Instrument |
| 1921 ANGYAL Musical Percussion Instrument Patent 9746 |
| 1921 ARTHUR Clock Watch Timekeeping Instrument |
| 1921 ROBERTS Musical Instrument Patent Print Art |
| 1921 DEAGAN Percussion Musical Instrument Patent |
| 1921 FRED DANIELSON C Stringed Musical Instrument |
| 1921 IVAN GRACANIN Musical Instrument Patent |
| 1921 OSTRANDER Stringed Musical Instrument Art |
| 1921 BALDWIN CO Mechanical Musical Instrument |
| 1921 HAWK Wind Musical Instrument Patent Print |
| 1921 AEOLIAN Automatic Musical Instrument Music Sheet |
| 1921 GOTTFRIED Musical Instrument Patent Print |