.~.~.~ Vertical pivot at right angle to horizontal pivot {3}
280.11
.~.~.~.~ Counterbalanced
DEFINITION
Classification: 248/280.11
Counterbalanced:
(under subclass 278.1) Vertical and horizontal pivots in which the force tending to move the outwardly extending portion about one or more of the horizontal axis rotatable connections is counteracted by a force (e.g., spring, weight, etc.).