Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 149, § 119

Any person operating a factory or workshop where emery wheels or belts or buffing wheels or belts injurious to the health of employees are used shall provide such wheels and belts with a hood or hopper connected with suction pipes, and with fans or blowers, in accordance with the following section, which apparatus shall be so placed and operated as to protect any person using such wheel or belt from the particles or dust produced by its operation, and to convey the particles or dust either outside of the building or to some receptacle so placed as to receive and confine them.