The ones we ran in the early 80’s were red.
I talked to the air lift rep at the trade show.
He said the first air lift bags were made out of rubber.
They then went to a polyurethane type of construction but was unsure of when that was.
He thought that they changed to poly some time in the 60’s
But this is just a educated guess
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69 442 post bench 3 pedal
Last edited by Bernhard; 04-17-2018 at 02:43 AM.
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