US PATENT SUBCLASS 219 / 137.42
.~.~.~.~ Having gas flow limiting shape (e.g., gas diffuser)

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
121.11  DF  .~ By arc {16}
137.2  DF  .~.~ With consumable electrode device {4}
137.31  DF  .~.~.~ Gun {7}
137.42.~.~.~.~ Having gas flow limiting shape (e.g., gas diffuser)

DEFINITION

Classification: 219/137.42

Having gas flow limiting shape (e.g., gas diffuser):

(under subclass 137.31) Subject matter wherein the nozzle is of a form which restricts the travel of gas toward the weld site.