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A self contained protective enclosure with an opening for entry and egress and a screen for ventilation and viewing.
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| Number | Title | Issue Date |
| 4783001 | Universal non-spreading railroad track haulage tie assembly A universal non-spreading railroad track haulage tie and support therefor characterized by opposed rail supporting channels, coaxially aligned with the rails of a railroad, the channels being secured together and against the rails respectively by a tie ga... | 11/08/1988 |
