100 candle power 'Pointolite' electric Lamp
1923
Rolls Royce 'Spirit of Innovation' electric aircraft
2021
Coolidge tube, United States, 1920
1920
Copper target with tungsten core attached to glass cold cathode tube
1913-1920
X-ray tubes
1910-1920
Glass-stoppered bottle containing tungsten
1801-1892 (prepared)
