Section 144. Posting of hours

1.  The employer shall make a schedule for
  all minors  employed  by  the  employer,  setting  forth  the  hours  of
  beginning  and  stopping  and the time allowed for meals, which shall be
  kept conspicuously posted in each establishment where such  persons  are
  employed.
    A  change  in  the  schedule of hours worked by minors pursuant to the
  provisions of this chapter shall be allowed  provided  that  the  posted
  schedule  reflects  the change.  Nothing herein shall be construed so as
  to affect the limitations on hours worked by such minors  as  set  forth
  elsewhere in this chapter.
    2.  The  presence  of  any person subject to this article at any hours
  other than those stated in the above notice, or the failure to post such
  notice, shall constitute prima facie evidence of  a  violation  of  this
  article.
    3.  Where  a  person  is employed in two or more establishments on the
  same day or week, the total time of employment  shall  not  exceed  that
  allowed per day or week in a single establishment.
    4.  Exception. If the commissioner finds that because of the nature of
  the work in a factory it is practically impossible to fix the  hours  of
  work weekly in advance, he may upon an application stating facts showing
  the  necessity  therefor,  grant  a  permit  dispensing  with the poster
  required by this section.  In  every  factory  operating  under  such  a
  permit, a time book shall be kept in a form approved by the commissioner
  showing  the  name  and  addresses  of  all  employees  subject  to this
  subdivision and the hours worked by each of them on each day.  No person
  shall knowingly make or suffer to be made a false entry in any such time
  book. Such time book shall be kept for a period of six years  and  shall
  be   available  upon  request  of  the  commissioner  at  the  place  of
  employment. The permit shall be posted conspicuously in the factory, and
  the commissioner may revoke the permit for failure to  comply  with  the
  provisions of this subdivision.