Vessels, marine systems or equipment, and specially designed components therefor, and marine boilers and components therefor. a. Underwater vision systems, as follows: a.1. Television systems (comprising camera, lights, monitoring and signal transmission equipment) having a limiting resolution when measured in air of more than 500 lines and specially designed or modified for remote operation with a submersible vehicle; or a.2. Underwater television cameras having a limiting resolution when measured in air of more than 700 lines; Technical Note: Limiting resolution in television is a measure of horizontal resolution usually expressed in terms of the maximum number of lines per picture height discriminated on a test chart, using IEEE Standard 208/1960 or any equivalent standard. b. Photographic still cameras specially designed or modified for underwater use, having a film format of 35 mm or larger, and having autofocusing or remote focusing specially designed for underwater use; c. Stroboscopic light systems, specially designed or modified for underwater use, capable of a light output energy of more than 300 J per flash; d. Other underwater camera equipment; e. Other submersible systems; f. Vessels, including inflatable boats, and specially designed components therefor, ; g. Marine engines (both inboard and outboard), and specially designed components therefor, ; h. Other self-contained underwater breathing apparatus (scuba gear) and related equipment, ; i. Life jackets, inflation cartridges, compasses, wetsuits, masks, fins, weight belts, and dive computers; j. Underwater lights and propulsion equipment; k. Air compressors and filtration systems, specially designed for filling air cylinders. l. Marine boilers designed to have any of the following: l.1. Heat release rate (at maximum rating) equal to or in excess of 190,000 BTU per hour per cubic foot of furnace volume; or l.2. Ratio of steam generated in kg per hour (at maximum rating) to the dry weight of the boiler in kg equal to or in excess of 0.83. m. Components for marine boilers described in 8A992.l.