controller

• someone who maintains and audits business accounts
• a mechanism that controls the operation of a machine
• a person who directs and restrains
• One who, or that which, controls or restraines
• An officer appointed to keep a counter register of accounts, or to examine, rectify, or verify accounts
• An iron block, usually bolted to a ship´s deck, for controlling the running out of a chain cable. The links of the cable tend to drop into hollows in the block, and thus hold fast until disengaged

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