Dec 7 (Reuters) - Yip's Chemical Holdings Ltd 0408.HK :
* Change of executive director and appointment of co-chief executive officers
* Says Wong Kam Yim will resign as the chief executive officer of the group
* Says with effect from 1 January 2016, Wong Yuk will be appointed as an executive director
* Yip Tsz Hin, deputy chairman and an executive director, together with Wong Yuk will be jointly appointed as co-chief executive officers
* Source text for Eikon ID:nHKS428Pyx
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