6 METALLIC SEALS AND ASSEMBLIES COMPRISING METALLIC SEALS AND RETAINERS THEREFOR
FIRST USE MAR 15 1977, IN COMMERCE MAR 15 1977, SINCE AT LEAST AS EARLY AS 1930 AS TO UAP. FIRST USE MAR 15 1977, IN COMMERCE MAR 15 1977, SINCE AT LEAST AS EARLY AS 1930 AS TO UAP.