| 2618912 | Stone polishing machine | 1952-11-25 | ||
| 2502995 | Door operating mechanism | 1950-04-04 | ||
| 2481124 | Door-operating mechanism for lift doors and the like | 1949-09-06 | ||
| 2432293 | Elevator car door control mechanism | 1947-12-09 | ||
| 2235381 | Door operating system for elevators | 1941-03-18 | ||
| 2235380 | Elevator door operator | 1941-03-18 | ||
| 2174524 | Door | 1939-10-03 | ||
| 2077659 | Door operating mechanism | 1937-04-20 | ||
| 1937029 | Elevator door operating mechanism | 1933-11-28 | ||
| 1934500 | Automatically operated elevator door | 1933-11-07 | ||
| 1911792 | Method of and apparatus for operating the doors of elevator installations | 1933-05-30 | ||
| 1534210 | Operating mechanism for elevator doors | 1925-04-21 | ||
| 1232903 | N/A | 1917-07-10 | ||
| 0642098 | N/A | 1900-01-30 |