(under subclass 1) Processes involving the connection of main or branch line channels to a tank or pipe under pressure without loss of any of the contents, or for the removal of undesirable material from the system or for the restoration of the system to a sound condition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
237+, and 315+, for apparatus employed for these purposes, and see the search notes to subclasses 237 and 315.
SEE OR SEARCH CLASS
166, Wells,
277, for processes of repairing wells, subclasses 311+ for processes of cleaning wells, and subclasses 378+ for processes of assembling wells.
