273. Minutes as evidence
(1) Minutes recorded in accordance with section 272 (minutes of directors' meetings), if purporting to be authenticated by the chairman of the meeting or by the chairman of the next directors' meeting, are evidence of the proceedings at the meeting.
(2) Where minutes have been made in accordance with that section of the proceedings of a meeting of directors, then, until the contrary is proved—
(a) the meeting is deemed duly held and convened,
(b) all proceedings at the meeting are deemed to have duly taken place, and
(c) all appointments at the meeting are deemed valid.