=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991 Grindstone 970/034 RLR(1969) is 10.1m below BM T.S.1(1959) =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993 Grindstone 970/034 RLR(1969) is 10.1m below BM T.S.1(1959)