Krupp Armament Works have (or had) facilities on Bochum, Germany. (Pinto, TRO3060, pag. 16)
Millennium Industries have (or had) facilities on Azania, Africa and North America (Chevalier, TRO3060, pag. 18 and Prowler, TRO 3085 Sup, pag 14)
Leopard Armor have (or had) facilities on North Africa. (Red Shit, TRO 3067, pag. 44)
Mitchell Vehicles in North America (Prowler, TRO 3085 Sup, pag 14)
Pandora ’Mech Works somewhere in terra, their Marksman tank was tested in the Australian Outback (TRO 3085 Sup, pag 16)
Maxwell-Pulaski Motors (Formely Vicore) is in Detroit (Galleon, TRO 3058U pag 68 and RecGuide 27 pag 6)
Blankenburg Technologies have (or had) facilities in Germany. (Grim Reaper, TRO 3055U, pag 44)
Bowie Industries had their headquarters in Chicago, under Lake Michigan, but got destroyed. (Gabriel, TRO 3050U, pag 148)
Bluth Corporation have (or had) facilities in the USA "near an industrial zone where a tank of shared name (but christened after a general) had been built centuries before.". Dont know much of USA tanks history, but that would be either New York state or Detroit. (Chaffe servicemech, TRO:V annex, pag. 200). As Fallen_Raven, Bluth´s primary factory is in Little Rock (Carbine, TRO:V Annex, pag. 210)