Rock Crusher History
Apr 16, when demand grew beyond the capabilities of one crusher, it was generally a simple matter to add a second machine to take care of the recrushing or secondary crushing work. a popular combination, for example, consisted of a no. 6 primary and a no. 4 secondary, or possibly a 20- x 10-in., or 24- x 12-in. primary jaw, followed by one of the small.