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 advisory capacity and shall cooperate with school
 authorities in regard to the education of apprentices.

 2.13 Qualifications of Teachers of Evening or Part-Time Trade
 and Technical Extension Classes.

 2.13-1 Experience in Industrial Occupation. Teachers of
 evening or part-time trade or technical extension
 classes shall have had at least six years of practical
 experience in the occupation to be taught, a mini-
 mum of two of which must have been at the journey-
 man or trained employee level. In any occupation
 requiring employees to be licensed by a legally
 constituted federal, state, or local licensing
 agency,' such teachers shall also hold a valid
 license to work in that occupation.

 2.13-2 Training for Teaching. No specific training is
 required for teachers of evening or part-time
 trade or technical extension classes other than
 the in-service training that may be required by
 local boards of public instruction.

2.2 Part-Time Joint School-Industry Classes.

 2.21 Procedure to Be Used by the State to Assure That Enrollees
 are Qualified and That.Instruction is Designed to Increase
 Occupational Competence. Part-time joint school-industry
 training classes may be conducted for persons who are
 enrolled in and receive part-time instruction in a voca-
 tional, technical, or comprehensive high school or in any
 day vocational school for adults and who receive on-the-job
 training through part-time employment in industrial
 occupations. Such employment shall be in an industrial
 occupation under written agreement between the school
 and employer and shall be in conformity with federal,
 state, or local employment regulations. When employ-
 ment is in establishments engaged in interstate commerce,
 such employment shall be at least at the legal minimum
 wage, except when an exemption certificate is secured
 from the Wage Determination and Exemption Branch of the
 Wage and Hour Division, United States Department of
 Labor, permitting employment at a sub-minimum wage.
 In certain occupations declared hazardous by the United
 States Department of Labor under the Fair Labor Standards
 Act, or by State Regulations, student-learners must be 18
 years of age unless specific exemption has been obtained