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 to permit those between the ages of 16 and 18 years to
 work at such occupations.

 Student-learners enrolled in part-time joint school-
 industry training classes shall be at least 16 years of
 age, have satisfactorily completed the tenth grade, and
 have finished at least one year of vocational shop train-
 ing specific to the occupation in which placed or two years
 of industrial arts beyond the sixth grade. Other than the
 age requirement, exceptions to the aforementioned may be
 made for twelfth grade students and adults.

 No student-learner shall be placed in a training establish-
 ment which is not approved by the advisory or craft
 committee of the school, nor shall any student-learner
 be placed in an occupation for which shop training is
 offered in the school except upon the recommendation of
 the instructor of that shop.

 No student-learner shall be placed in an apprenticeable
 occupation which is represented locally by an active joint
 or plant apprenticeship committee and for which the
 school offers related instruction, except upon the re-
 commendation of that committee.

 Only those classes composed entirely of persons employed
 in industrial occupations may be reimbursed fromfederal
 or state matching funds.

 The training provided through the operation of cooperative
 programs shall be for skilled or semi-skilled occupations
 which offer opportunities for training and advancement,
 and the instruction shall be designed to enlarge the voca-
 tional and technological intelligence of the enrollees.

2.22 Time for Classes and Employment, and Non-Reimbursement
 of Sectional Classes. Enrollees in part-time joint school-
 industry classes shall be employed for at least half of the
 usual working week of the occupation in which they are
 employed, and in no case shall the weekly hours of employ-
 ment be less than 15 nor more than 25 hours per week
 exclusive of the days school is not in session. The time
 at work shall equal or exceed the time in clock hours
 devoted to school instruction throughout the year. In no
 case shall the time at school and the time at work be such
 as to violate legal employment regulations.

 In programs covering two school years, an average of at
 least one regular class period a day must be devoted to