Power Supply unit for Teleprinter Machine

Rectangular box and base, manufactured from folded and spot welded sheet steel and finished in grey hammertone paint. The base contains power supply components, including a rolled electrical lead, to run a teleprinting machine. The lid is removable and is vented with two vertical cooling slots at each end and a series of cooling holes drilled into the front panel. An aluminium label with the word 'DANGER' printed in red letters is attached to the top of the box.

Unknown.