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Patent US3664270 - Covered hopper car with hatch cover means - Google

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Patent US7735426 - Hopper cars with one or more discharge control

Patent US6067912 - Automated discharge system for hopper car - Google
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Patent US5259322 - Five unit articulated covered hopper car - Google

Patent US5433559 - Pressurized hopper car - Google Patents

Patent US20080066642 - Rail road hopper car fittings and method of

Patent US7080598 - Railway hopper car with longitudinal discharge