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 minimum course requirement shall be offered in the eleventh
 and twelfth grades only. In vocational high schools, the
 tenth grade shop program shall be considered in addition
 to the minimum time requirement stated above. In regular
 and comprehensive high schools the program shall be
 limited to the eleventh and twelfth grades.

 Technical classes for which Smith-Hughes or George-
 Barden (Title I) funds are used shall be operated to include
 as much time as type B day trade classes with not less
 than two consecutive periods daily devoted to laboratory
 experiences.

 Type C classes may be operated for less than nine months
 per year, for less than 30 hours per week. Type C courses
 shall not be set up as a substitute for type A or type B all-
 day trade preparatory classes and shall not attempt to
 train persons for entrance into the skilled trades or those
 occupations requiring an established long-term apprentice-
 ship period, except when the amount of shop instruction
 meets the time requirements of the type B program.

 Type C technical preparatory classes are designed to train
 technicians at the post-high school level. The time and
 age requirements established for type C day trade prepara-
 tory classes shall also apply to this type of technical train-
 ing.

 No preparatory program, including intermediate and advanced
 courses, shall be organized in any trade for a total of more
 than 2800 hours.

2.42 Qualifications of Shop or Laboratory Teachers.

 2.42-1 Experience in the Industrial Occupation to Be Taught.
 Types A and B day trade shop and technical labora-
 tory teachers shall have had at least six years of
 practical experience or its equivalent in the
 occupation to be taught, a minimum of two of which
 must have been at the journeyman or trained
 employee level, except that only two years of
 experience as a mechanic, technician, or engineer
 shall be required of graduates of four-year college
 technical institutes or schools of engineering
 approved by the State Board for those teachers
 teaching trade or technical courses. In any