| 1935 GEN ELECTRIC Heating Apparatus And System |
| 1939 GEN ELECTRIC Heat Exchange Apparatus Patent |
| 1939 GEN ELECTRIC Air Flow Control Apparatus Art |
| 1931 BUTLER Electric Signaling Apparatus Patent |
| 1935 LANDIS Electric Welding Apparatus Patent |
| 1900 LINDBOHM Electric Stun Fishing Apparatus Patent 73 |
| 1943 MENARD Electric Control Apparatus Patent |
| 1953 GEN ELECTRIC Timer Apparatus Patent Print |
| 1941 HENNINGER Electric Motor Apparatus Patent |
| 1904 RECKLINGHAUSEN Vapor Electric Apparatus Patent 111 |
| 1882 FARMER Electric Lighting Apparatus Patent 11848 |
| 1880 FINNEY Electric Lighting Apparatus Patent 11194 |
| 1936 GEN ELECTRIC Rail Inspection Apparatus Art |
| 1944 FISH Electric Signaling Apparatus Patent |
| 1895 DOEHRING Electric Bathing Apparatus Patent 8602 |
| 1888 THOMSON Electric Welding Apparatus Patent 11153 |
| 1940 ELECTRIC TRAPS INC Exterminating Apparatus |
| 1879 DIEHL Electric Light Apparatus Clamp Patent 11209 |
| 1938 GEN ELECTRIC Rail Inspection Apparatus Art |
| 1936 SAUL Electric Clock Apparatus Patent Print |
| 1893 KINTNER Electric Car Apparatus Patent 6106 |
| 1964 GEN ELECTRIC Cryogenic Apparatus Patent |
| 1897 MCMENAMIN Electric Bell Chime Apparatus Patent 109 |
| 1900 TERRY Electric Lighting Apparatus Patent 11123 |
| 1879 HOLCOMBE Electric Light Apparatus Patent 11206 |
| 1948 LANDMEIER Electric Timing Apparatus Patent |
| 1956 GEN ELECTRIC Timer Apparatus Patent Print |