| 1921 DE VOE Thread Tension Support Patent Print |
| 1921 DOBYNE Heating System Wax Thread Sewing Machines |
| 1921 LILY Thread Cutter And Holder Patent Print |
| 1921 SINGER Thread Severing Mechanism Sewing Machines |
| 1921 WEIS Thread Controlled Electric Stop Motion |
| 1921 J A B HOLT Thread Holder And Tensioner Art |
| 1921 UNITED SHOE MACHINERY CORP Thread Gripping |
| 1921 SINGER CO Thread Controlling Sewing Machines |
| 1921 UNION Thread Controlling Mechanism Sewing Machines |
| 1921 ARBETTER Thread Delivering Mechanism Art |
| 1921 HAYES Thread Delivering Mechanism Patent |
| 1921 MEYER Thread Waxing Device Patent Print Art |
| 1921 MYERS Thread And Implement Holder Patent |
| 1921 DE Thread Severing Mechanism Sewing Machines |
| 1921 SUMMIT THREAD Sewing Machine Shuttle Art |
| 1921 SINGER MFG CO Thread Tension Support Patent |
| 1921 JACOB Universal Thread Stand Patent Print |
| 1921 CHAMPION Heating System Wax Thread Sewing Machines |
| 1921 SEELY Thread Gripping Cutting Shoe Sewing Machines |
| 1921 HERR Thread Controlling Sewing Machines Art |
| 1921 MATSON Thread Holder And Tensioner Patent |
| 1921 SEAL Combined Thread Holder And Cutter Art |
| 1921 W O HOUSTON Combined Thread Holder Cutter |
| 1921 UNITED SHOE MACHINERY CORP Thread Waxing |
| 1921 BERTRAND Thread Gripping Device Patent |