‘Chemical lasers’, as follows: a. Hydrogen Fluoride (HF) ‘lasers’; b. Deuterium Fluoride (DF) ‘lasers’; c. ‘Transfer lasers’, as follows: 1. Oxygen Iodine (O 2 -I) ‘lasers’; 2. Deuterium Fluoride-Carbon dioxide (DF-CO 2 ) ‘lasers’; 3. ‘Non-repetitive pulsed’ Nd: glass ‘lasers’ having any of the following: a. ‘Pulse duration’ not exceeding 1 μs and output energy exceeding 50 J per pulse; or b. ‘Pulse duration’ exceeding 1 μs and output energy exceeding 100 J per pulse;