Section 45. Notice to employers

The employer to whom notice of death or
  disability is to be given, or against whom claim is to be  made  by  the
  employee,  shall  be  the employer who last employed the employee in the
  employment to the nature of which the disease was due  and  such  notice
  and  claim  shall  be  deemed seasonable as against prior employers. The
  requirements as to notice as to occupational disease and death resulting
  therefrom shall be the same as required  in  section  eighteen  of  this
  chapter,  except  that  the notice shall be given to the employer within
  two years after the disablement or after the  claimant  knew  or  should
  have  known  that  the  disease  is due to the nature of the employment,
  whichever is the later date.