Hugh I would guess like you that the demand for belt pulley was falling off by the mid fifties. We used one on a hammer mill into late sixties though. Have a couple of old IH bulletins about the pulleys if I could find them. They seem to imply that IH only used the iron pulleys because they couldn't get enough paper ones. One bulletin in 55 annouced paper pulleys back and the iron ones used when the fiber pulleys were not available would no longer be supplied, but sell iron ones already in stock until exausted. Some of the paper pulleys that came out then were made a little stronger with 8 bolt hole mounting instead of 4.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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