(under subclass 78) Chains which upon the application of tension will be extended and will automatically resume their normal length when the tension is removed.
SEE OR SEARCH CLASS
114, Ships,
213+, for extensible springs used to prevent tension or strain from rupturing yielding parts of a ship.
267, Spring Devices,
69+, for elastic extension devices which are extensible upon
application of tension and recover when the tension is removed; and subclasses 80+ for a panel of interlinked extensible/recoverable spring-influenced members (e.g., bed spring panel).
