30 CFR § 35.1
The regulations in this part set forth the requirements for fire-resistant
hydraulic fluids and concentrates for the production thereof to procure their
certification as approved for use in machines and devices that are operated
in coal mines and procedures for applying for such certification.
[Schedule 30, 24 FR 10201, Dec. 17, 1959, as amended at 52 FR 17515, May 8,