13 – Cancellation of Consent.

§  13.  Cancellation of consent. When a consent to the plan shall have
  been filed in the office of the county  clerk  as  herein  provided,  it
  shall  be  binding  upon both parties thereto as long as the relation of
  employer and employee exists between the parties, and expire at the  end
  of  such  employment,  but it may at any time be canceled on sixty days'
  notice in writing from  either  party  to  the  other.  Such  notice  of
  cancellation  shall  be  effective  only if served personally or sent by
  registered letter to the last known post-office address of the party  to
  whom  it  is addressed, but no notice of cancellation shall be effective
  as to a claim for injury occurring previous thereto.