(a) A pledgee;
(b) A person who has purchased or agreed to purchase the shares. 7. Notwithstanding a provision in a proxy, stating that it is irrevocable, the proxy becomes revocable after the pledge is redeemed. This paragraph does not affect the duration of a proxy under subdivision two. 8. A proxy may be revoked, notwithstanding a provision making it irrevocable, by a purchaser of shares without knowledge of the existence of the provision unless the existence of the proxy and its irrevocability is noted conspicuously on the face or back of the certificate representing such shares. 9. No director, officer, clerk, teller or bookkeeper of a corporation shall act as proxy at any meeting of such corporation.