| 1921 REED Fingering Attachment Stringed Instruments |
| 1921 ABRAHAM Attachment Stringed Instruments Art |
| 1921 STROMBERG Tuning Stringed Musical Instruments |
| 1921 GROVER Tuning Peg Stringed Musical Instruments |
| 1921 JAMESON Air Motor Automatic Musical Instruments |
| 1921 WINTERHOFF Socket Wind Instruments Art |
| 1921 MCHUGH Bridge Stringed Musical Instruments |
| 1921 O'BRIEN Mouthpiece Musical Instruments Art |
| 1921 SINCLAIR Tuning Wind Musical Instruments |
| 1921 PAPE Housing Phonetic Instruments Patent 41050 |
| 1921 MORSE Wear Compensating Gearing Instruments |
| 1921 LINDSEY Tuning Peg Mounting Musical Instruments |
| 1921 BENNE HENTON H Mouthpiece Musical Instruments |
| 1921 MARX Fretting Stringed Musical Instruments |
| 1921 WILLIAM Mouthpiece Reed Instruments Art |
| 1921 RALPH Circuit Closer Musical Instruments |
| 1921 DIBERT Transposing Pneumatic Musical Instruments |
| 1921 GROVER Bridge Musical Stringed Instruments |
| 1921 HUMES Attachment Reed Musical Instruments |
| 1921 BUESCHER Key Pad Wind Musical Instruments |
| 1921 Eversharp Lead Pencils Writing Instruments Art Ad |