Sec. 21.4. Authorized means and methods. (See § 21.3, subd. [b], supra.) The following means and methods are authorized for window cleaning as hereinafter set forth:

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(a) working from safe surfaces.
(b) Working from window sills or ledges.
(c) Working from ladders.
(d) Working from boatswain's chairs.
(e) Working from scaffolds.

                    
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