Air quality measurement apparatus, namely, particle counters; Amplifiers; Bags adapted for laptops; Ballasts for halogen lights; Batteries; Battery chargers; Calculating machines, data processing equipment and computers; Calculating machines, data-processing equipment and computers; Cameras; Cases for music, audio and related electronic equipment, namely, cases for audio tuners, audio receivers, amplifiers, tape players, compact disc players, MP3 controllers/players, audio mixers, audio speak...