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GB1093542A
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Pipe joint synthetic plastic concrete
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US3160939A
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Oscillating packer roller
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US3234619A
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Apparatus for making longitudinally prestressed concrete pipes
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US3098764A
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Annular track member for a spinning cylindrical pipe core during interior lining operation
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US3036931A
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Pipe coating process and apparatus
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GB847760A
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Tension wire anchoring device for prestressed concrete pipes
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GB866020A
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Prestressed concrete pipe and joint therefor
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GB836267A
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Means for prestressing concrete pipe
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US2887130A
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Anchor lug for pipe tension wire
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US2965947A
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Vibrating pipe forming machine
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US2822598A
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Pipe mold vibrator
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US2840880A
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Process for casting concrete pipe
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US2822989A
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Means for prestressing concrete pipe
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US2722044A
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Compacting roller for centrifugal casting machine
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CA632138A
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Prestressed concrete pipe and joint therefor
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CA770503A
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Pipe joint of synthetic plastic concrete
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CA608808A
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Method and means for prestressing concrete pipe
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CA612907A
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Anchor lug for pipe tension wire
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