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