Ear plugs for swimming purposes; life preservers; hard hats; submergible electronic machinery for underwater divers, namely, self-rescue apparatus in the nature of oxygen breathing units and snorkels for use in scuba diving, and breathing apparatus for divers in the nature of rebreathers and soda lime cartridges; cameras; photography lights, namely, camera flashes and camera strobes; movie cameras; electronic communication machinery, namely, telephones, portable telephones, antennas, portable...