Osram Miners Bulbs Boxes.
Made by the Osram General Electricity Company Ltd. H M Mines Department Standards.
Box contained 25 pearl 4 volts – 1 amp gas filled krypton bulbs. Size 7″ x 7″ x 2″ inches.
These were stocked in the lamproom in all collieries for spares and repairs to the miners cap lamps.