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Safety shut-off valve

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Patent

CA 1023727

Derval Victor E.

F - Mech Eng,Light,Heat,Weapons – 16 – K
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Muchow John D.

F - Mech Eng,Light,Heat,Weapons – 16 – K
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Wells Richard E.

F - Mech Eng,Light,Heat,Weapons – 16 – K
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Willis Oil Tool Co.

F - Mech Eng,Light,Heat,Weapons – 16 – K
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