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Electric Lamp bulb
Ismay Lamps Ltd
20th c.
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Halogen bulb 03000
Welch Allyn
c.1987-1990
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Halogen bulb 03700 for use with a streak retinoscope
Welch Allyn
1987
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Halogen bulb 04900
Welch Allyn
Early 1990s
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Hamblin-Lister lamp bulb
Theodore Hamblin Ltd
Mid 20th c.
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Osram 3715 lamp bulbs
Osram
Late 20th c.
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