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In page M5 Tractor:

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Production of the original M5 High-Speed Tractor began in May 1943, running for 24 months a total of 5290 tractors were produced. They had a simple folding top with side curtains for the protection of the gun crew from the elements, the driver was located in the front centre and there were inwards facing seats for total crew of 9. After 1944 the vehicles were fitted with the M49C ring mount that allowed it to be armed with an M2 Browning machine gun for local and air defence.[1][2][3]