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I suspect they were prone to leaking; also, it's cheaper to have fixed window as you eliminate the cost of hinges and cranks. The amount of air movement with vent windows and under-dash vents was quite good, anyway, at least in that era. (I've owned some vehicles from the 60's-70's and they really didn't impress me in that respect. I found the vent windows to be useless. But on my '49 Packard & '51 Ford? You can get some major turbulence going on!)
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Bryan
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