Guangdong yingfan circuit co. LTD also has 4 open invention patents under trial:
1.CN110267430A circuit board for blind slot and its preparation process
2.CN110248467A a laminated seamless composite circuit board and its preparation method
3.CN110248476A a fault discontinuous reticulated circuit board and its preparation process
4. Manufacturing method of countersunk head hole of CN110202638A composite circuit board
