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US4003685A
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Apparatus for molding plastic pipe with enlarged portions formed therein
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US3986963A
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Septic tank tee
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US3919367A
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Method for molding plastic pipe with enlarged portions formed therein
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US3916763A
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Apparatus for forming slits in tubes
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US3861152A
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Corrugated drainage pipe with staggered arrangement of plateau recesses
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US3861153A
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Corrugated drainage pipe with staggered arrangement of rib interruptions
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US3941639A
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Tube doffing and bundling method
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US3899198A
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Coupling for interconnecting corrugated plastic tubes
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US3859025A
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Apparatus for making corrugated plastic pipes with integral coupler collar
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US3904228A
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Septic tank tee
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US3877831A
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Method of apparatus for drilling holes in tubes
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US3870774A
|
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Pipe doffing and bundling method
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US3910713A
|
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Method for making corrugated plastic tubing
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US3891733A
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Method of making corrugated plastic pipe with integral coupler collars
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