| 1931 AULD D L CO Locking Device Patent Print Art |
| 1931 LARSEN AXEL Game Device Patent Print Art |
| 1931 ALLEN Safety Device For Sewing Machines Art |
| 1931 BROOKS JOHN Signal Device Patent Print Art |
| 1931 ROSS CHARLES Spring Device Patent Print Art |
| 1931 ISIDOR WAGNER Game Device Patent Print Art |
| 1931 TRAVILLA Railway Truck Centering Device Art |
| 1931 SMITH Stop Device For Sewing Machines Art |
| 1931 JACKSON Gun Holding Device Patent Print Art |
| 1931 PHILIP BOK Flare Device Patent Print Art |
| 1931 SEARING Stabilizing Device Patent Print Art |
| 1931 H M BUNKER & CO INC Seam Opening Device Art |
| 1931 SMALL Device For Operating Car Couplers Art |
| 1931 DOUGLAS Life Saving Device Patent Print Art |
| 1931 DECKER Golf Putting Device Patent Print Art |
| 1931 LA RIZZA Amusement Device Patent Print Art |
| 1931 ZIGTEMA Life Saving Device Patent Print Art |
| 1931 FIELD Interlocking Device For Railroads Art |
| 1931 HENRY Stage Display Device Patent Print Art |
| 1931 ALLEN Arrow Testing Device Patent Print Art |
| 1931 LLEWELLYN Amusement Device Patent Print Art |
| 1931 ESTEY M TURNER Golf Practicing Device Art |
| 1931 JAMES Amusement And Exercising Device Art |