. "quired in Subdivision O, Machinery and Machine Guarding. (C) Cleaning or inspecting pulpers or other work, including work above the pulper in a dangerous position, shall be in accordance with ??1910.147, Lockout, in Subdivision J. (D) All power mechanisms shall be guarded in accordance with Subdivision O, Machinery and Machine Guarding. (f) Pulping devices." . . .