US PATENT SUBCLASS 111 / 156
.~.~ Chisel opener
Current as of: June, 1999
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(under subclass 149) Apparatus wherein the opening element is specifically disclosed as working deep in the soil and having such a configuration that it merely lifts the soil and does not shift it laterally of the line of the furrow.
SEE OR SEARCH THIS CLASS, SUBCLASS:
123, for a chisel-type opener used with a liquid or gas soil treatment.
SEE OR SEARCH CLASS
172, Earth Working,
699+, for chisel-type openers, per se.