3. Hearing-aid acousticians may carry on their professional activities within a limited liability partnership or a joint-stock company if at all times,(1) all of the voting rights attached to the partnership units or company shares are held(a) by 1 or more hearing-aid acousticians;
(b) by a legal person, trust or any other enterprise whose voting rights attached to the units, shares, equity securities or other rights are held entirely by one or more hearing-aid acousticians; or
(c) in any combination by a person, a trust or another enterprise referred to in subparagraphs a and b of subparagraph 1 of the first paragraph;
(2) in the case of a joint-stock company, all of the non-voting shares are held:(a) by 1 or more hearing-aid acousticians;
(b) by a relative, either by direct or indirect line of descent, of a hearing-aid acoustician, who holds shares referred to in subparagraph 1 of the first paragraph;
(c) by the spouse of a hearing-aid acoustician who holds shares referred to in subparagraph 1 of the first paragraph;
(d) by a legal person, trust or another enterprise whose voting rights attached to the units, shares, equity securities or other rights are held entirely by a person referred to in subparagraphs a, b or c of subparagraph 2 of the first paragraph; or
(e) in any combination by a person, a trust or an enterprise referred to in subparagraphs a, b, c or d of subparagraph 2 of the first paragraph;
(3) the partners or, as the case may be, the directors are hearing-aid acousticians carrying on their professional activities within the partnership or joint-stock company; and
(4) no partner or shareholder has an interest in an undertaking for the manufacture or wholesale of hearing aids sold within the partnership or joint-stock company.