93. For the purposes of this Division, the word “broker” means any person dealing commercially in shares, bonds, debentures, debenture stock or other securities, and includes any person who offers to sell or buy or who sells or buys such securities on behalf of another person; but it does not include the notary who is not regularly appointed agent for a person, firm or corporation doing a brokerage business, and who acts as intermediary between his client and such broker.