T-SQL (SS2K8) :: Finding The Item Filled In Prior To Current One

I have data similar to the below

CREATE TABLE #TEMP
(
TYPE VARCHAR(10),
SEQ INT,
SUB_TYPE VARCHAR(10))

[Code] ....

Now for each type the seq is very important. Effectively by order of seq the subtype stays the same until another subtype changes it. So for TYPE1 100,110 and 150 are A. 170, 200,220 are B. 230 and 250 are C and so on.

However as you can see the data isnt actually stored in the row. I need a select statement that shows this data.

I have done this:

SELECT t1.*,t3.SUB_TYPE FROM #TEMP t1
CROSS APPLY
(SELECT MAX(SEQ) SEQ FROM #TEMP AS t2 WHERE t1.SEQ >= t2.seq AND t2.SUB_TYPE <>'' AND t1.TYPE = t2.TYPE
GROUP BY t2.TYPE) t2
INNER JOIN
#TEMP t3
ON t3.TYPE = t1.TYPE AND t2.SEQ = t3.SEQ

And it seems to work. Is this the easiest way to do it or am i missing something?