Research team

 patent：

201120148568. X   Within the square frame quadrupole stents and device
Participate in the standard:

GB/T6093-2001 GPS - length standard - block gauge,
JB/T 10313-2002 block gauge testing method,

JB/T10631-2006 ceramic needle gauge

JB/T10743-2007
The ceramic block gauge, etc.,