All associations or companies or corporations doing an assessment life, health or accident insurance business in this state on the first day of January, 1925, on the assessment or mutual benefit plan, known as group or circle associations, or otherwise, and defined in this article as mutual benefit associations, are, by this article, legalized, ratified and confirmed and said associations, companies or corporations may continue to do business in this state if they comply with this article through their charters and bylaws and they accept the conditions of and, in other respects, comply with the provisions thereof. The conditions of the validation of said associations, companies or corporations, and their authority to do business in this state under certain restrictions, are hereinafter prescribed.