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Patent US3677196 - Covered hopper car - Google Patents
Intermediate Hopper
Patent US6244191 - Hopper rail car - Google Patentsuche
Patent US5259322 - Five unit articulated covered hopper car - Google
Covered Hopper Train Cars (22 Units - Approximately 632 metric tons
Patent US6412421 - Gate assembly for a railroad hopper car - Google Patents
Patent US3664270 - Covered hopper car with hatch cover means - Google