Patents claims Patent us3664270 Hopper cars 3250
Patent US3664270 - Covered hopper car with hatch cover means - Google
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Patent us7735426Hopper car covered pullman dizzy wonderings wanderings Virginia beach fire academy: hopper carHow to build model....
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Patent us4362111
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Hopper car hazmat .
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Patent US3677196 - Covered hopper car - Google Patents
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Patent US3664270 - Covered hopper car with hatch cover means - Google
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Patent US5433559 - Pressurized hopper car - Google Patents
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Patent US4362111 - Covered hopper car - Google Patents
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How to Build Model...
Virginia Beach Fire Academy: Hopper Car | HAZMAT
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Patent US6412421 - Gate assembly for a railroad hopper car - Google Patents
![Hopper Cars 3250 - [PDF Document]](https://i2.wp.com/static.fdocuments.us/img/1200x630/reader024/reader/2021022406/577d364b1a28ab3a6b92bb6d/r-1.jpg?t=1627391331)
Hopper Cars 3250 - [PDF Document]
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How to Build Model...
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Patent US7735426 - Hopper cars with one or more discharge control