US3014721A
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Pin distributing mechanism
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US3030110A
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Ball track junction
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US3018104A
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Ball speed controlling device
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US3011785A
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Pinfall detection and indication
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US3018103A
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Pin distributor
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US3015049A
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Pin distributor
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US2979333A
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Bowling ball return mechanism
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US2941804A
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Bowling pin handling mechanism
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US2930617A
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Bowling pin handling mechanism
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US2941802A
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Bowling pin handling mechanism
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US2911079A
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Clutch
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US2941803A
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Automatic pinsetter trip device
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US2999690A
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Bowling pin changing mechanism
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US2949300A
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Automatic pinsetters
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US2967708A
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Pin handling mechanism
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US2991078A
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Completely automatic pin setting and ball return mechanism for bowling alley
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