DIAMOND OIL WELL DRILLING COMPANY Trademarks
DOWDCO DIAMOND OIL WELL DRILLING COMPANY
Filed: May 2, 1980
OIL WELL DRILLING BITS
Owned by: DIAMOND OIL WELL DRILLING COMPANY
Serial Number: 73260574
DOWDCOPAX
Filed: December 1, 1980
OIL WELL DRILLING BITS
Owned by: DIAMOND OIL WELL DRILLING COMPANY
Serial Number: 73288091
"DOWDCO SPONGE BARREL"
Filed: April 9, 1981
Down Hole Apparatus Used in Conjunction with a Well Corer for Absorbing and Storing Subterranean Fluids in Order that the…
Owned by: DIAMOND OIL WELL DRILLING COMPANY
Serial Number: 73304914
