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Thomas Edison obtained a patent for an electrographic vote recorder.
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| Number | Title | Issue Date |
| 4393786 | Track crossing for a two track suspension railroad A track crossing for a carriage of a two track suspension railroad arranged in a box girder has, on both sides of a slot provided in the lower flange of the box girder, running surfaces for support wheels, and at the sidewalls of the box girder, current r... | 07/19/1983 |
| 4041876 | Vehicle guiding system In a vehicle guidance system, a circular-section guidance rail is embraced y a detector on a vehicle. At a fork, where the rail progressively broadens prior to dividing, the rail height is reduced so that a detector, when tilted to select one branch of the... | 08/16/1977 |
