

"In 1965 Eastman Kodak replaced the individual flashbulb technology used on early Instamatic cameras with the Flashcube developed by Sylvania Electric Products. A flashcube was a module with four expendable flashbulbs, each mounted at 90° from the others in its own reflector."
After you used up all 4 flash bulbs in the cube, you removed it and snapped on another one.
It was like a semiautomatic flash clip.
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