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Etymology of "M" and "B" bulb and "X". The "M" in M-sync was used to indicate magnesium, which, at the time, was the filament used in flash bulbs. The "B" bulb refers to the rubber pneumatic bulb used to hold a shutter open and then close. The "X" in X-sync refers to the xenon gas used in an electronic flash. Henry Araujo (talk) 10:59, August 17, 2014 (UTC)

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