| 1921 WEIS Thread Controlled Electric Stop Motion |
| 1921 WOOD EDGAR Automatic Train Stop Patent |
| 1921 IVES Toy Railway Train Stop Patent Print |
| 1921 FESSENDEN REGINALD Stop Clock Patent Print |
| 1921 ERFERD Automatic Train Stop Patent Print |
| 1921 HARRY M BENNETT Automobile Engine Stop Art |
| 1921 CAR DUMPER & EQUIPMENT COMPANY Car Stop Art |
| 1921 MILLS WILLIAM Stop Motion Device Patent |
| 1921 CANTRALL Automobile Engine Stop Patent |
| 1921 MOSES CULBERTSON Train Stop Signal Patent |
| 1921 KILBURN Automatic Safety Train Stop Mechanism |
| 1921 DAWSON Automatic Train Stop Patent Print |
| 1921 R H MACY INC Safety Attachment Stop Watches |
| 1921 ALBURY Automatic Stop Mechanism Railroads |
| 1921 JONES Stop Electric Railway Trains Art |
| 1921 VON Safety Attachment Stop Watches Art |
| 1921 HANEY FRANK Train Stop Patent Print Art |
| 1921 HUMISTEN METZLER Train Stop Patent Print |
| 1921 ELDREAD BARRAND Train Stop Patent Print Art |
| 1921 SIMPSON GEORGE Car Stop Patent Print Art |
| 1921 SUBMARINE SIGNAL CO Stop Clock Patent Print |
| 1921 CALEB LIDDICOAT Car Brake Or Stop Patent |
| 1921 RENAULT Train Stop And Signal System Patent |