| 1921 FRITZ Electric Winding Device Patent Print |
| 1941 CARLSON Electric Timing Device Patent Print |
| 1940 MYERS Electric Tempo Device Patent Print |
| 1940 BATES Electric Timing Device Patent Print |
| 1938 GEN ELECTRIC Control Device Patent Print |
| 1924 WARREN Electric Signal Device Patent Print |
| 1941 GEN ELECTRIC Time Delay Device Patent Print |
| 1938 GEN ELECTRIC Restraint Device Patent Print |
| 1956 GEN ELECTRIC Timing Device Patent Print Art |
| 1920 ROOT Electric Signaling Device Patent Print |
| 1930 SCOTT Electric Alarm Device Patent Print |
| 1959 FLEMING Electric Arming Device Patent Print |
| 1932 RALPH Electric Switch Device Patent Print |
| 1958 HANS Electric Timing Device Patent Print |
| 1944 GEN ELECTRIC Restraint Device Patent Print |
| 1953 DAVID Electric Timing Device Patent Print |
| 1922 GEN ELECTRIC Timing Device Patent Print Art |
| 1925 EDUARDO RABONI Electric Device Patent Print |
| 1949 GEN ELECTRIC Control Device Patent Print |
| 1928 TULLOCH Electric Switch Device Patent Print |
| 1949 SEAVEY Electric Firing Device Patent Print |
| 1946 GEN ELECTRIC Control Device Patent Print |
| 1931 ELECTRIC BOAT CO Safety Device Patent Print |
| 1963 HENRY Electric Barrier Device Patent Print |
| 1960 SMITH Electric Signal Device Patent Print |
| 1925 GEN ELECTRIC Timing Device Patent Print Art |
| 1943 GEN ELECTRIC Time Delay Device Patent Print |
| 1932 MYERS Electric Alarm Device Patent Print |
| 1943 JENSEN Electric Target Device Patent Print |