- 30 (number) - Wikipedia
The number of days in the months April, June, September and November (and in unusual circumstances February—see February 30) Although the number of days in a month vary, 30 is used to estimate months elapsing
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- . 30 carbine - Wikipedia
In 1944, Smith Wesson developed a hand-ejector revolver to fire 30 carbine It went through 1,232 rounds without incident From a four-inch (102 mm) barrel, it launched the standard GI ball projectile at 1,277 ft s (389 m s), producing an average group of 4 18 inches (106 mm) at 25 yards (23 m); the military decided not to adopt the revolver
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