(under subclass 40) Subject matter for testing fluid operative systems or fluid handling conduits while in their operative assembly or position.
SEE OR SEARCH CLASS
48, Gas: Heating and Illuminating,
193, for means associated with a gas main to detect or indicate leaks without positive means to create a condition whereby leakage is produced in a defective pipe or joint; and subclass 195 for the preparation of odorous material and/or the insertion thereof into a gas main.
166, Wells,
179, and the subclasses here noted for packer or plug devices in wells which are inherently capable of use as fluid pressure leakage testers.
