Laboratory experimental machines and apparatus for communications, acoustics, and signal processing; laboratory equipment and supplies, namely, incubators; laboratory glassware; furnaces for laboratory experiments; actinometers; aerometers; air analysis apparatus; alcoholmeters; alidades; altimeters; anemometers; precision weighing balances; weighing equipment, namely, balances; steelyards; balancing apparatus for measuring equilibrium; meteorological balloons; barometers; laboratory equipmen...