"TC SU-4957" = Transport Canada (Canadian regulatory authority); SU-4957 is the permit (same as US DOT exemption)
"230 Bar" = working pressure in bar
"DOT" = Department of Transportation
"E14157" = DOT exemption code in U.S.
"3442" = service pressure 3442 psi
"TP5250" = test pressure 5250 psi
"REE 75.3" = rejection elastic expansion
"X7" = XS Scuba 7" diameter series
"100" = 100 cuft
"3308138" = Serial number.
The "06A06" initial hydrotested in June 2006. The "A" separating the 06 and 06 is a special symbol consisting of a capital "A" on top of a capital smushed-down "T." This indicates that the initial hydrotest was performed by Authorized Testing (company name).
"M8004" = code indicating Worthington tank facility in Tilbury, Canada (assigned by DOT)