=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 05-MAY-94 :
UP TO 1985 LEUPOLD & STEVENS GAUGE, 1985-1993 (OCTOBER) OTT GAUGE,
1993 (OCTOBER) - SONAR RESEACRH GAUGE
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 05-MAY-94 :
REVISION OF MAY 1994 UPDATES DATA FROM AUTHORITY D6
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 25-Nov-2010 :   
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