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Percy W. (jr.) Schumacher

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Drill bit

F - Mech Eng,Light,Heat,Weapons – 16 – C
Patent

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Drill bit

E - Fixed Constructions – 21 – B
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Drill bit seal

F - Mech Eng,Light,Heat,Weapons – 16 – J
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Pressure relief device for drill bit lubrication system

E - Fixed Constructions – 21 – B
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Seal means for drill bit bearings

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Profile ID: LFCA-PAI-P-192985

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