| 1938 ROTHENHOEFER WALTER Airplane Patent Print |
| 1938 WALTER TRIPKE Teeter Totter Patent Print |
| 1938 PERRON WALTER Dusting Machine Patent Print |
| 1938 KOLM WALTER Game Device Patent Print Art |
| 1938 WALTER HOMM Piano Patent Print Art |
| 1938 PADGETT WALTER Time Switch Patent Print Art |
| 1938 WALTER MAJEWSKI Toy Vehicle Patent Print |
| 1938 DARBY WALTER Disk Scaling Game Patent Print |
| 1938 WOOD WALTER Airplane Kite Patent Print Art |
| 1938 FRANKLIN WALTER Chromatic Harp Patent Print |
| 1938 KIDDE WALTER Airplane Flotation Art Print |
| 1938 ROTHENHOEFER WALTER Aeroplane Patent Print |
| 1938 EVERTS WALTER Propeller Patent Print Art |
| 1938 WALTER Tennis Ball Receptacle Patent Print |
| 1938 DEAN WALTER Rail Car Truck Patent Print Art |
| 1938 HOFFMAN WALTER Threshold Patent Print Art |
| 1938 STEELE WALTER Harmonica Patent Print Art |
| 1938 BASELT WALTER Clasp Brake Patent Print Art |
| 1938 WALTER Artificial Fishing Bait Patent Print |
| 1938 WALTER Tail Skid For Airplanes Patent Print |
| 1938 WALTER PARSONS Needle Threader Patent Print |