https://www.osha.gov/laws-regs/standardinterpretations/1977-02-03
Interpretation on metal manhole ladder standards. | Occupational Safety and Health Administration
February 3, 1977 Mr. Beryl M. May Manager - Safety American Telephone and Telegraph Company 295 North Maple Avenue Basking Ridge, New Jersey 07920 Dear Mr. May:
safety and healthon metalladder standardsinterpretationmanhole