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| Number | Title | Issue Date |
| 4784356 | Variable placement interchangeable lamp system A variable placement lamp system for use with a supporting member is disclosed which includes a plurality of lamp housings (40) each including a channel for receiving an upper edge of a supporting member. Screw (50) on both sides of the housing (40) are t... | 11/15/1988 |
| 4666108 | Extensible railroad grade crossing gate arm A railroad crossing gate (20) is disclosed having a novel crossing arm (24) which includes a first longitudinal arm (26) member with a telescopically inserted second longitudinal arm member (28). The second arm member (28) is slideable to any one of a plu... | 05/19/1987 |
| 3964704 | Operating mechanism for railroad crossing gate The operating mechanism of a railroad crossing gate employs a variable mechanical advantage connection to transmit force from the drive motor to the gate member to raise and lower the same. The main shaft of the mechanism serves as a mount for the gate me... | 06/22/1976 |
