Thread: USPatent 3,937,202--Economy Driving Aid
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Old 01-06-2010, 10:20 PM   #1 (permalink)
gone-ot
...beats walking...
 
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USPatent 3,937,202--Economy Driving Aid
...anybody seen / read about this before?

Economy driving aid - Google Patent Search

...looks like a "high-tech" vacuum-switch "vacuum gauge."
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