Section 20

Service at the address or, where there is more than one place of business, at the address of the principal place of business shown in the statement furnished in pursuance of this Act, as the address or the address of the principal place of business, as the case may be, at which any firm, indi-vidual, or corporation registered under this Act is carrying on business of any comn1unication or notice or of any writ, summons, plaint, pleading, order or other document, pro-ceeding, or process whatsoever in any action, suit, proceed-ing, or matter, either by leaving the same at such office or by sending the same by registered post postage prepaid addres-sed to such firm, individual, or corporation at such address shall be deemed to be service upon any partner of the firn1

or upon the individual or corporation, as the case may be.