.~ Open-ended hollow skirt type (e.g., trunk type) {15}
210
.~.~ With weight balancing means
DEFINITION
Classification: 92/210
(under subclass 208) Apparatus including means adapted to be added to or removed from the piston to vary the weight of the piston for the purpose of (1) equalizing the weight of the piston with respect to another piston with which the piston is to be associated or (2) equalizing the weight of a portion of the piston with respect to another portion of the piston.
(1) Note. This subclass includes pistons provided either with integral projections which may be cut away as desired to vary the weight of the piston or with separate weight elements which may be attached or removed from the piston to vary the weight of the piston.
