OT -x a x b c d –e f g
x = Our Internal Identification Use
a =Function
    1:Gas Tube Arrester   2:Protector  Magazine 
    3:Earth Bar  4:Test Plug with Cable
    5: Test  Plug  w/o  Cable
    6:Disconnection Plug  7:Dummy  Plug
x = Our Internal Identification Use 
b = Type Gas Tube Arrester 
    1:3 Pole 350V W/Fail-SAFE
    2: 3 Pole 350V W/O Fail-SAFE
    3: 3 Pole 230V W/Fail-SAFE
    4: 3 Pole 230V W/O Fail-SAFE
    Protector Magazine
    1:10Pair 3 Pole Magazine W/O Arrester 
    2: 8 Pair 3 Pole       Magazine W/O Arrester
    3: 5Pair 3 Pole Magazine W/O Arrester 
    Earth  Bar
    1:For 10 Pair 2: For 8 Pair
    Test Plug with Cable
    1:2 Pole Test Plug to 6p4c Plug
    2: 4 Pole Test Plug to 6p4c Plug
    3: 2 Pole Test Plug to Alligator Clip
    4: 4 Pole Test Plug to Alligator Clip
    Test Plug w/o Cable
    1:2 Pole Test Plug Kit(Gray)
    2: 4 Pole Test Plug Kit(White)
    Disconnection Plug  &  Dummy  Plug
    1:Red  2:Green  3:Black  4:Blue
    5:White 6:Yellow 7:Gray
c = 0
d = 0
e, f, g = Serial No.