(a) If an attendant is provided, he shall be instructed in the proper operation of the installed machines and proper procedure in event of solvent spillage or gas discharge.

(b) Addresses and telephone numbers at which the owner or the attendant, if any, may be reached in any emergency shall be conspicuously posted.

(c) Instructions for normal operation shall be posted on or near each machine.

(d) A notice shall be posted on or near each machine warning that cleaned garments or materials retaining the odor of the cleaning solvent may be harmful if placed in a small enclosed space such as an automobile.