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Caterpillar celebrated the production of 175,000 medium high drive (elevated sprocket) track-type tractors by producing three commemorative 175,000 units. Caterpillar celebrated the production of ...
The Cat D4H, D5H, D6H and D7H medium dozer models were the first to feature the high drive design, and in 1987, the D8L model was added to the family.