As pic's given below:
Now eg it may be like A-19
the alphabet gives the range of months like
A-Jan,Feb, March or upto March(1st Qtr)
B-April,May,June or upto June(2nd Qtr)
C-July,August,Sept or upto Sept(3rd Qtr)
D-Oct,Nov,Dec or upto Dec (4th Qtr)
And the number gives the year 19 means the year 2019
Now for eg A-19 cylinder is valid untill March 2019.
Hope u all check for the validity date once the cylinder is delivered.
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