. . . . . . "tractors" . "gun tractor" . . "Heavy artillery tractor" . . . "artillery tractors" . . "Artillery tractor" . . . "M34 artillery prime mover tractors" . . "haul heavy artillery" . . "Artillery Tractors" . "heavy artillery tractor" . . . . . . "towing vehicle" . . "artillery tractor" . . . . "prime movers" . . . "artillery prime movers" . "tractor" . "Artillery tractor" . . . . . "artillery prime mover" . . . "towed" . "Armoured artillery tractor" . . "prime mover" . "Quad 4 x 4 tractor" . "gun tractors" .