Dummy nuclear fuel element, presented by the General Electric Co, USA

`Selectest' Multi-Range Test Meter Type D111

Concentric plug and socket, GEC

Two bulbs, one in box, one in base

CDX-3 dental X-ray tube

Coolidge tube, United States, 1920

SPT X-ray tube for deep therapy at 250 kV

Rectifying valve

Rotating anode x-ray tube

"Magnet" electric kettle of 1911

'Osram'

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