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Unread 02-05-2015, 11:20 AM   #6
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Dean Romig
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Paker SBT's starting in 1917 had ventilated ribs. AHE 204548 was the first double to have a factory-installed vent rib and that was a 1923 gun. The 1923 catalog was the first to offer the ventilated rib.
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