§ 141. Orders, notices and service. Every motor carrier operating
pursuant to a certificate or permit issued under this chapter shall file
with the commissioner a designation in writing of the name and post
office address of a person upon whom or which service of notices or
orders may be made. Such designation may from time to time be changed by
like writing similarly filed. In default of such designation, service of
any notice or order may be made by posting in the office of the
commissioner. Whenever notice is given by mail as provided herein the
date of mailing shall be considered as the time when notice is served.