9 MECHANICAL APPARATUS FOR MEASURING FLUID FLOW-NAMELY, PRESSURE DIFFERENTIAL PRODUCING APPARATUS OF THE ANNULAR ORIFICE TYPE FOR MEASURING GAS OR AIR FLOW THROUGH BLAST FURNACE MAINS OR SIMILAR CONDUITS
Trademark Events
Oct 13, 1997
Expired Sec. 9
Nov 15, 1982
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.