| 1921 FREDERICK P HAMBLY Game Apparatus Patent |
| 1921 EBERT FREDERICK Card Game Patent Print Art |
| 1921 FREDERICK Propeller Patent Print Art |
| 1921 FREDERICK BEISSEL Game Patent Print Art |
| 1921 FREDERICK RAE Propeller Patent Print Art |
| 1921 FREDERICK Variable Pitch Propeller Patent |
| 1921 FREDERICK Immersible Salvage Vessel Patent |
| 1921 WESTPHAL FREDERICK Game Device Patent Print |
| 1921 FREDERICK Ship'S Bells Clock Patent Print |
| 1921 BLANDIN FREDERICK Tone Chamber Patent Print |
| 1921 FREDERICK LANGE Animal Trap Patent Print |
| 1921 FREDERICK Secondary Electric Clock Patent |
| 1921 FREDERICK Amusement Apparatus Patent Print |
| 1921 FREDERICK KAHLER Slack Adjuster Patent |
| 1921 PETERS FREDERICK Target Patent Print Art |
| 1921 GREENE FREDERICK Fishing Device Patent |
| 1921 FREDERICK Burglar Or Thief Alarm Patent |
| 1921 FREDERICK HACHMANN Toy Vehicle Patent Print |
| 1921 SANDOZ FREDERICK Flytrap Patent Print Art |
| 1921 WESTON FREDERICK Pedal TORRINGTON CO Patent |
| 1921 ROOT WALTER Game FREDERICK BEISSEL Patent |
| 1921 ZEIDLER FREDERICK Canoe Patent Print Art |