1920 - GMC became the first company to develop research laboratories under the direction of Charles Kettering.
1924 - J. L. Hudson's in Detroit became the first air-conditioned department store.
More Michigan firsts.
1920 - GMC became the first company to develop research laboratories under the direction of Charles Kettering.
1924 - J. L. Hudson's in Detroit became the first air-conditioned department store.
More Michigan firsts.
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