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| Number | Title | Issue Date |
| 4634087 | Grooved rail switch with a tongue rail device A grooved rail switch with a tongue rail device includes a tongue rail displaceably supported on a torsion-stiff support box for movement between a stock rail and a switch rail. The support box is made up of an upper slide plate, a lower bottom plate and ... | 01/06/1987 |
| 4589617 | Frog for switches This invention relates to an improvement in a frog for switches, in particular for rapid transit switches, with a junction rail mounted in a rotatable manner and adapted to close a gap between pairs of rails of straight or branch track, the improvement co... | 05/20/1986 |
