.~.~ Including internal, diverse, perimetric layer
DEFINITION
Classification: 249/201
(under subclass 197) Apparatus wherein the sink head or hot top is composed of plural layers of different material, one of the layers providing an inner lining for the other.
SEE OR SEARCH THIS CLASS, SUBCLASS:
61+, for molding apparatus having a layer which is destroyed.
112+, and 114.1, for molding apparatus having plural layers.
134+, for a mold composed of a named material.
SEE OR SEARCH CLASS
138, Pipes and Tubular Conduits, 140+, for pipe or tubular conduit composed of distinct layers.
164, Metal Founding,
359+, for a sand mold having means to compensate for shrinkage. Class 164 provides exothermic hot tops; see also
subclasses 53+ for in situ reactive heating processes.
