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Patent US3664270 - Covered hopper car with hatch cover means - Google
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Covered Hopper Rail Car - FrieghtCar America
Covered Hopper Railcars for Lease – MRC : MRC
3D covered hopper car railroad - TurboSquid 1530704
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Patent US4362111 - Covered hopper car - Google Patents
5459 - TrinityRail
Patent US3664270 - Covered hopper car with hatch cover means - Google