Pitheadgear:
1960s coal mining training poster, kinetic handling of tubs
Pitheadgear:
1960s coal mining training poster, ventilation quantity measurement
Pitheadgear:
1960s coal mining training poster, ventilation pressure survey
Pitheadgear:
1960s coal mining training poster, roof supports, hydraulic props
Pitheadgear:
1960s coal mining training poster, roof supports, self advancing hydraulic
Pitheadgear:
1960s coal mining training poster, roof supports, props chocks and link bars