Bob, I have been able to get some further info over the past 2 years. So far I have 4 different date code systems, 3 on hoses and 1 on ferrules (at either end of a hose assy).

Here goes

Therapy Key

A B C D E F G H I J

1 2 3 4 5 6 7 8 9 0

Format AAF/JI where first letter is year (ie A-2001)

Datex Ohmeda Key

B R I T O X Y G E N

1 2 3 4 5 6 7 8 9 0

Format NY NI NN where last two letters is year (ie NN-2000)

Oxylitre

OX (x inside the o) marked on ferrule with 2 digit number corresponding to year

MIE/Intersurgical Key

As Therapy code


MEC Key

S V H Y F L O M E D

0 1 2 3 4 5 6 7 8 9

Format YSS/FSV where last letter corresponds to year (ie v-2001)

Hope this is of use, and I must apologize if there are any errors.