序号 | 专利名 | 申请号 | 申请日 | 公开(公告)号 | 公开(公告)日 | 发明人 |
---|---|---|---|---|---|---|
21 | Electromagnetic relay | US4620125 | 1925-07-27 | US1699782A | 1929-01-22 | JOHN ERICKSON |
22 | Apparatus for controlling electric circuits | US1622004D | US1622004A | 1927-03-22 | ||
23 | Combination safe and vault protector. | US1909527547 | 1909-11-11 | US1004321A | 1911-09-26 | WEST EDWIN W |
24 | Relay. | US1908421430 | 1908-03-16 | US951623A | 1910-03-08 | STEVENS ALTON E |