Vehicle
1923 Mack AB
251 cid, I-4, 35 bhp

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Highlights
  • In 1920, Mack pioneered power brakes on trucks, using a vacuum-booster system
  • 1 ½ ton AB built on August 10, 1923 and delivered to Pacific Gas and Electric in San Francisco on September 23, 1924
  • Price new: $3,000
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