BRIEF-Kolen receives patent
* Says it received China patent on March 24, for photographic lens optical system
Feb 6 Shenzhen Kangtai Biological Products Co Ltd
* Shenzhen Kangtai Biological Products' shares to debut trade on Feb 7 - Shenzhen stock exchange
Source text in Chinese: bit.ly/2kIhcMw (Reporting by Hong Kong newsroom)
WASHINGTON, March 23 U.S. President Donald Trump warned House Republican lawmakers that he will leave Obamacare in place and move on to tax reform if they do not get behind new healthcare legislation and support it in a vote on Friday.