Caterpillar DW21 '09.1950–61

In late 1950 Caterpillar introduced the DW20 and DW21 self-propelled scrapers. The DW20 had a two-axle tractor configuration, and the DW21 used a single-axle tractor design. They were first publicly unveiled at the construction equipment Road Show, held in Chicago, Illinois, in August 1948.

• DW21 (8W) ('1950-55);
• DW21C ('1955-58);
• DW21D ('1958-59);
• DW21G ('1959-61).

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