As mentioned, we are checking our production records.
We have no clear answer now.
We think the production of punch QFN was started
before Saw QFN. But still under checking.
Following is only information from you.
“when is start produce corner lead with chamfer design”
We can’t catch the point of this question.
And we have to check all information and records.
Is it possible for you to give us more detailed information
to catch the point of this issue ?