(under subclass 118) Device wherein at least one spirally wound layer constitutes the wall structure or a part thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
122, for spirally corrugated flexible pipe.
SEE OR SEARCH CLASS
57, Textiles: Spinning, Twisting, and Twining,
207, and 210+ for a strand comprising a core with a spirally wound constituent.
156, Adhesive Bonding and Miscellaneous Chemical Manufacture, appropriate subclasses for apparatus and processes for forming tubes, etc., by a laminating operation and see especially 169+, 184+ and 425+ for forming tubes etc., by a winding operation. See also subclasses 143+ for processes of reinforcing a flexible tube with a helical wire coil or wire rings.
