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| Number | Title | Issue Date |
| 4426012 | Railway car coupler A railway car coupler includes a shank, a head connected to a head end portion of the shank, a knuckle pivoted to the head having closed and open positions, and a lock axially movable within a chamber formed in the shank between a knuckle engaged position... | 01/17/1984 |
| 4391380 | Rail car coupler interlock The invention pertains to a safety interlock for rail car couplers wherein a detent positioned by the rail car compressed air braking system prevents the rail car couplers from being unlocked as long as the rail car brake system is supplied with compresse... | 07/05/1983 |
