(under subclass 647) Subject matter wherein the structure includes means for stretching the material.
(1) Note. "Tensioning" as used herein does not include the inherent tensioning that occurs when the material is bowed or slightly bent when inserted into retaining slots or grooves.
SEE OR SEARCH THIS CLASS, SUBCLASS:
, FOR 960, for a foreign art collection involving a fluid-treating apparatus film-holding tensioning device.
