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Patent US5433559 - Pressurized hopper car - Google Patents
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Patent US5433559 - Pressurized hopper car - Google Patents
Patent US5259322 - Five unit articulated covered hopper car - Google
Patent US7735426 - Hopper cars with one or more discharge control
Hopper Cars 3250 - [PDF Document]
Patent US3677196 - Covered hopper car - Google Patents
Patent US5259322 - Five unit articulated covered hopper car - Google
Covered Hopper Train Cars (22 Units - Approximately 632 metric tons
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