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They are based in Ft Wayne, Indiana.
The linings for the friction plates are very much like the linings on the single disc clutch plate. The wear factor is another thing to consider since the teeth wear in the drum and on the hub. If the teeth are good and the steels aren't too scored or burned then a plate can be reused. Reline the frictions and clean up the steels.
In service, the clutch lining material that wears off would pack into the grooves of the drum and after a time it would cause the plates to stick and not move in the grooves. It took a while to have problems but eventually they would need to have the crud removed to make them effective again.