84.
An individual, association of individual, company or institution who designs a coal mining system, method of coal mining, machinery plant, equipment, appliance or substances for the use of coal mines called . . . . . . . .

86.
When any roadway or face in direct line with haulage track and persons may be explosed to danger from runway tubs the effective contrivance provided is . . . . . . . . to prevent such danger.

89.
Minimum practical experience of driving a winding engine or as an assist to qualified engine driver appear for the engine drivers certificate examination for period of at least . . . . . . . . year.

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