| 1921 HEINRICH Mechanical Time Fuse Patent Print |
| 1921 TASSELL PARK Mechanical Toy Patent Print |
| 1921 RICHARD Transposing Mechanical Piano Players |
| 1921 EDWARD Mechanical Baseball Game Patent |
| 1921 ANDRESS Mechanical Toy Patent Print Art |
| 1921 COXEY JASPER Mechanical Toy Patent Print |
| 1921 DYE Radio Aerial Mechanical Torpedo Patent 22378 |
| 1921 JENSEN CARL Mechanical Toy Patent Print Art |
| 1921 GUY Mechanical Riding Horse Patent Print |
| 1921 DAVID ZAIDEN Mechanical Doll Patent Print |
| 1921 WELSH CLYDE Mechanical Toy Patent Print Art |
| 1921 GEORGE HAZELTON Mechanical Toy Patent Print |
| 1921 HUTH Automatically Reversible Mechanical Toy |
| 1921 JONES JONATHAN Mechanical Toy Patent Print |
| 1921 MCCONNELL DUNCAN Mechanical Horn Patent |
| 1921 EDUARD Mechanical Attachment Patent Print |
| 1921 KLAXON COMPANY Mechanical Horn Patent Print |
| 1921 MELVIN DAHL Mechanical Horse Patent Print |
| 1921 JOHN BOE Mechanical Toy Patent Print Art |
| 1921 TOWER Mechanical Musical Instrument Patent |
| 1921 CHURCHILL Mechanical Control Of Sails |
| 1921 MAURICE Wind Chest Mechanical Piano Players |
| 1921 LUKENS Mechanical Stock Feeder Patent Print |
| 1921 BALDWIN CO Mechanical Musical Instrument |
| 1921 KRUPP AG Mechanical Time Fuse Patent Print |
| 1921 JOSEPH MITERA Mechanical Toy Patent Print |
| 1921 ELOF SPONGBERG Mechanical Toy Patent Print |