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Patents hopper Freight car guide: fmc 4700cf covered hopper Patent us5259322
Patents hopper car claims covered drawingNwhs nw-b17624-nw mech dwg Hopper railcarPatent us7735426.
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NWHS NW-B17624-NW Mech Dwg
Patent US5259322 - Five unit articulated covered hopper car - Google
5459 - TrinityRail
Freight Car Guide: FMC 4700cf covered hopper
Patent US7735426 - Hopper cars with one or more discharge control