| 1931 ARMSTRONG Safety Blasting Device Patent |
| 1931 ADLER Traffic Signal Casing SAFETY Patent 49307 |
| 1931 BROWN JOHN Safety Tower Patent Print Art |
| 1931 GEORGE Safety Device For Ships Patent Print |
| 1931 RUTHERFURD Safety Firearms Art Print Patent |
| 1931 JOSEF Safety Device For Firearms Patent |
| 1931 JOHN Safety Device For Boats Patent Print |
| 1931 SMITH Safety Drop Door Hook Patent Print |
| 1931 BARNER HAROLD Safety Cracker Patent Print |
| 1931 MCCUNE Safety Car Control Equipment Patent |
| 1931 ANDREWS Submarine Safety Device Patent |
| 1931 HYMAN Automatic Safety Stop Patent Print |
| 1931 ROBINSON Submarine Safety Apparatus Patent |
| 1931 ADLER Signals Support Casing SAFETY Patent 49308 |
| 1931 SILVIO Railroad Safety Device Patent Print |
| 1931 CRONE Safety Support For Brake Rods Patent |
| 1931 WOLFE EVERETT Safety Handball Patent Print |
| 1931 CARLSON Safety For Repeating Guns Patent |
| 1931 ELECTRIC BOAT CO Safety Device Patent Print |
| 1931 ADLER Head Casing Signals SAFETY Patent 49309 |
| 1931 PETER Inflatable Safety Device Patent Print |
| 1931 SAFETY BOAT CO Ventilator Patent Print Art |
| 1931 JOSEPH KEENAN Safety Gate Patent Print Art |