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A pressure gauge for each pressurized compartment designed for human occupancy;
A two-way voice communication system between occupants and a dive team member at the dive location;
1910.423(c)(4)(iv) A Viewport; And
1910.423(c)(4)(v) Illumination Capability to Light the Interior
A built-in-breathing-system with a minimum of one mask per occupant;

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1910.430(f) Commercial Diving Operations, Decompression Chambers
Each decompression chamber manufactured after the effective date of this standard, shall be built and maintained in accordance with the ASME Code ...