73037995
Jan 27, 1975
Sep 14, 1976
OIL WELL CEMENTING EQUIPMENT FOR MOUNTING ON OIL WELL CASINGS-NAMELY, CENTRALIZERS, TURBOLIZERS, SCRATCHERS, CLEANERS, STOP COLLARS, SEALS, CEMENT BASKETS, PIPE CENTRALIZERS FOR MOUNTING ON TUBING OR THE LIKE FOR CENTRALIZING THE SAME, VALVES, CHOKES AND PARTS THEREOF, OIL WELL PARAFFIN SCRAPERS AND PARTS THEREOF AND PUMPS
Machinery