law: 19. Restriction of power of Trustees to vote in certain cases.-
  No Trustee shall vote or take part in the discussion of any matter coming up for consideration at a meeting of the Board or any of its committees if the matter is one in which he has any direct or indirect pecuniary interest by himself or his partner, or in which he is interested professionally on behalf of a client or as agent for any person other than the Government 1[or an undertaking owned or controlled by the Government] or a local authority or a trade union registered under 2[the Trade Unions Act, 1926 (16 of 1926), or other than as officer or member of an association formed for the purpose of promoting the interests or welfare of any class of employees of the Board].