70. Service of notices---(1) Any notice or other document required or
 authorised to be served on or given to any person for the purposes of
 this Act may be served or given by delivering it to that person, and may
 be delivered to that person either personally or by leaving it at that
 person's usual or last known place of abode or business or at the
 address specified by that person in any application or other document
 received from that person or by posting it in a letter addressed to that
 person at that place of abode or business or at that address.

   (2) If any such notice or other document is sent to any person by
 registered letter, it shall be deemed to have been delivered to that
 person on the fourth day after the day on which it was posted, and in
 proving the delivery it shall be sufficient to prove that the letter was
 properly addressed and posted.

   (3) If the person is absent from New Zealand, the notice or other
 document may be delivered as aforesaid to that person's agent in New
 Zealand. If that person is deceased, the notice or other document may be
 delivered as aforesaid to that person's personal representatives.

   (4) If the person is not known, or is absent from New Zealand and has
 no known agent in New Zealand, or is deceased and has no known personal
 representatives, or if for any other reason it is not practicable to
 deliver the notice or other document personally, the notice or other
 document shall be delivered in such manner as may be directed by the
 Commissioner or the Arbitration Commission.

   (5) Notwithstanding anything in the foregoing provisions of this
 section, the Commissioner or the Arbitration Commission may in any case
 direct the manner in which any notice or other document is to be served
 or given, or dispense with the service or giving thereof.