GE GDT550HGD - Nomenclature; Model Number Breakdown

1RPHQFODWXUH
6HULDO 1XPEHU
7KH ILUVW WZR FKDUDFWHUV RI WKH VHULDO QXPEHU LGHQWLI\ WKH PRQWK DQG \HDU RI PDQXIDFWXUH
([DPSOH /=6 -XQH 
$ ± -$1  ± =
' ± )(%  ± 9
) ± 0$5  ± 7
* ± $35  ± 6
+ ± 0$<  ± 5
/ ± -81  ± 0
0 ± -8/  ± /
5 ± $8*  ± +
6 ± 6(3  ± *
7 ± 2&7  ± )
9 ± 129  ± '
= ± '(&   $
7KH OHWWHU GHVLJQDWLQJ WKH \HDU
UHSHDWV HYHU\  \HDUV