F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
189/66
F16L 9/02 (2006.01)
Patent
CA 1283370
ABSTRACT OF THE DISCLOSURE A spirally wound corrugated pipe of sheet steel or the like is provided with outwardly convex corrugations which are spaced apart, with a flat portion of single wall thickness between adjacent corrugations. In one embodiment, the corrugations have a pitch of five inches and a height of one-half inch; in another embodiment, the pitch is six inches and the height is one inch.
544809
Burke-Robertson
Holcomb Richard A.
Mid-State Drainage Products Inc.
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