| 1938 LOHMAN Tremulant Stringed Instrument Patent 21286 |
| 1938 ROBERTSON Amplifying String Instrument Patent21287 |
| 1938 RUSSELL Stringed Musical Instrument Patent |
| 1938 TRAITWEIN Electrical Musical Instrument Patent 11 |
| 1938 FREEMAN Musical Instrument Patent Print Art |
| 1938 JOHN L H HAND Nautical Instrument Patent |
| 1938 MARTIN P GRAUENHORST Musical Instrument Art |
| 1938 DOPYERA Stringed Musical Instrument Patent 21285 |
| 1938 BORG AXEL Stringed Instrument Patent Print |
| 1938 CONN LTD C G Wood Wind Instrument Patent |
| 1938 SWENSEN EMIL Timing Instrument Patent Print |
| 1938 JOHN Automatic Musical Instrument Patent |
| 1938 OTTO MIESSNER Musical Instrument Patent |
| 1938 GOULD Musical Instrument String Patent |
| 1938 DUANE PRATHER Stringed Musical Instrument |
| 1938 WILHELMINA Musical Instrument Patent Print |
| 1938 HUMES GUY Musical Instrument Patent Print |
| 1938 OMAR MUSSER Musical Instrument Patent Print |
| 1938 FRIEDRICH Electrical Musical Instrument Art |
| 1938 FRITZ Nautical Instrument Patent Print Art |
| 1938 WILLIE BERG Musical Instrument Patent Print |
| 1938 ANTHONY Musical Instrument Valve Drip Cup |
| 1938 HARRIS Measuring Instrument POWELL Patent 48979 |
| 1938 V C SQUIER Musical Instrument String Art |
| 1938 MACKAY Arrangement Instrument Dials Art |
| 1938 WILHELMINA HOSCHKE Musical Instrument Art |
| 1938 OKER Strain Tester Instrument OPTICAL Patent 26137 |
| 1938 ROBERTSON Amplifying Stringed Instrument |
| 1938 RUDOLPH Stringed Musical Instrument Patent |
| 1938 JOHANN Wind Musical Instrument Patent Print |
| 1938 ALLEN Wood Wind Instrument Patent Print Art |
| 1938 Thru The Overcast - Art of Instrument Flying |