The following chemical substances shall not be used or stored except by competent persons under laboratory conditions approved by a nationally recognized agency acceptable to the Secretary.
(a)
Carbon tetrachloride,
(e)
4,4-Methylene Bis (2-chloroaniline),
(f)
Methyl-chloromethyl ether,
(g)
3,3 Dichlorobenzidine,
(h)
Bis (chloromethyl) ether,
(n)
2-Acetylaminofluorene,
(o)
4-Dimethylaminobenzene, and
(p)
N-Nitrosodimethylamine.