| 1920 FREDERICK S DEARDEN Chalk Hanger Patent |
| 1920 FREDERICK Bunk Construction Patent Print |
| 1920 FREDERICK Amusement Apparatus Patent Print |
| 1920 FREDERICK BRUNJES Boat Patent Print Art |
| 1920 OSIUS FREDERICK Machine Motor Patent Print |
| 1920 WHYTE FREDERICK Metal Roof For Cars Patent |
| 1920 FREDERICK Artificial Fish Bait Patent Print |
| 1920 FREDERICK PETERMAN Doll's Eyes Patent Print |
| 1920 EICHORN FREDERICK Automobile Lock Patent |
| 1920 EARLE FREDERICK Lock Switch Patent Print |
| 1920 GIBSON FREDERICK Amusement Device Patent |
| 1920 FREDERICK Craft Propulsion Mechanism Patent |
| 1920 FREDERICK Sewing Machine Attachment Patent |
| 1920 FREDERICK Aeroplane Control Patent Print |
| 1920 FULLERTON FREDERICK Pistol Patent Print Art |
| 1920 METZ FREDERICK Train Order Delivery Patent |
| 1920 FREDERICK Drinking Fountain Patent Print |
| 1920 COLE FREDERICK Signaling Device Patent |
| 1920 FREDERICK J STOLPE Brake Apparatus Patent |
| 1920 FREDERICK S DEARDEN Chalk Hanger Patent |
| 1920 WELLS FREDERICK Automobile Lock Patent |
| 1920 NEWLIN FREDERICK Tambourine Patent Print |