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Patent US7735426 - Hopper cars with one or more discharge control
Cylindrical Covered Hopper
Patent US6067912 - Automated discharge system for hopper car - Google
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Patent US5433559 - Pressurized hopper car - Google Patents
Equipment for internal and external cleaning of hopper cars
Equipment for internal and external cleaning of hopper cars
Patent US6774318 - Removable material hopper assembly and method of
Hopper Car Inspection