An apprenticeable occupation is a skilled trade which possesses all
of the following characteristics:
(a) It is customarily learned in a practical way through a
structured, systematic program of on-the-job supervised training.
(b) It is clearly identified and commonly recognized throughout an
industry.
(c) It involves manual, mechanical or technical skills and knowledge
which require a minimum of 2,000 hours of on-the-job work experience.
(d) It requires related instruction to supplement the on-the-job
training.