Group 9: Hydraulic Drills 29.30 18.90----LABORERS (TUNNEL CONSTRUCTION, FREE AIR). Shield Drive and Liner Plate Tunnels in Free Air.----13a) Miners, Motormen, Mucking Machine Operators, Nozzle Men, Grout Men, Shaft & Tunnel Steel & Rodmen, Shield & Erector, Arm Operator, Cable Tenders 32.22 20.10 + a 13b) Brakemen, Trackmen 31.28 20.10 + a
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