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Caterpillar 955C Traxcavator

  • Allis-Chalmers HD-6 crawler

    Allis-Chalmers HD-6 crawler

    Chris Graham on 3rd February 2020

    The Allis-Chalmers HD-6 crawler launched in 1955, with high expectations which, as Paul Tofield explains, were proved thoroughly justified.

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