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0ctober 50 air compressor Acme Machinery Approved under Schedule April 29 April 30 August 30 Bureau of Mines coal-drilling machine Colmol mining machine conveyor drive unit Conveyor power unit December 29 detachable type PT detachable-type PT piggyback Diesel locomotive distribution box drilling machine dry-cell type Electric and Manufacturing elevating conveyor Ensign Electric EQUIPMENT Approved February Goodman Manufacturing Information Circular 7722 issued to J. H. issued to Transocean J. H. Fletcher January Jeffrey Manufacturing Joy Manufacturing July 28 l0 hp l5 hp Lee-Norse loading machine Machinery-Moving Equipment March 27 Marietta continuous miner Marietta Manufacturing METHANE ALARM METHANE DETECTORS Approved model kO air motors National Mine Service proval PT piggyback conveyor Riken methane-indicating detector Safety Appliances Schedule 2E Schedule 8C September 22 shuttle car Spray Supply Units three l0-hp tractor tread loader Type CD^2 Type DM8 Drill Type Joy type PT piggyback Type WL80B vith detachable type Water Spray Supply