electronic pressure calculating device used in conjunction with a deadweight tester for the purpose of eliminating measurement errors of pressure calibrations

Musical recordings; Entertainment services in the nature of live musical performances; Presentation of live show performances; Providing online music, not downloadable; Music production services

children's books

aircraft air testing instrumentation, namely air pressure controllers for measuring aircraft altimeters, air speed, rate of climb, mach indicators, air data computer, engine pressure ratio instrumentation