American School of Correspondence · Chicago, American school of correspondence · leaf 320
-BOLSTER. -PACKINQj … BASE —STEP. rig. 201. Spindle Parts. S, the cover, C, of which forms a lock to prevent pulling the spindleout of the bolster when doffing. The stem of the bolster is threadedto receive a nut for securing the base to the spindle rail. The cups are usually of brass and are made several sizes to…
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