| 1957 JOHNSON Folding Boat Trailer Patent Print |
| 1957 RICE Expansible House Trailer Patent Print |
| 1957 PETERSEN Design Trailer Wire Stringer Patent 48493 |
| 1957 GRONLUND ERNST Boat Trailer Patent Print |
| 1957 BLUBAUGH Drive On Lift Trailer Patent Print |
| 1957 KURKA Collapsible Camping Trailer Patent |
| 1957 SOUTHERLAND Trailer Boat Patent Print Art |
| 1957 BALKO NORMAN Boat Trailer Patent Print Art |
| 1957 HOOTEN JACK Boat Trailer Patent Print Art |
| 1957 ZUR Expansible Trailer Structure Patent |
| 1957 OVERTON One Man Boat Trailer Loader Patent |
| 1957 ANTHONY MAMO Boat Trailer Patent Print Art |
| 1957 LARSON Tow Trailer For Tractor Patent Print |
| 1957 LEE Mobile Sanitary Trailer Patent Print |
| 1957 DAVE House Trailer Porch Assembly Patent |
| 1957 AGRICOLA FREDERICK Boat Trailer Patent |
| 1957 PAUL ASPERGER Dumping Trailer Patent Print |
| 1957 COOK SIMON Boat Trailer Patent Print Art |
| 1957 HILLE Expansible Camping Trailer Patent |
| 1957 PETERSEN Trailer and Wire Stringer Fencing Patent |
| 1957 EBERLY Collapsible Trailer Patent Print Art |
| 1957 MCDONALD Self Loading Boat Trailer Patent |
| 1957 RAWLINGS Extensible House Trailer Patent |
| 1957 SOUTHERLAND HETSEL Trailer Boat Patent |