block system
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block system [′bläk ‚sis·təm]

(civil engineering)

A railroad system for controlling train movements by using signals between block posts, that is, the structures that contain the instruments indicating the positions of trains, conditions within block sections, and control levers for signals and other functions.

(mining engineering)

A system of pillars in which a series of entries, rooms, and crosscuts are driven to divide the coal into blocks of about equal size which are then extracted on retreat.

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block system (redirected from Block (group theory))

block system
(redirected from Block (group theory))