conducting business and market research surveys by telephone

electronic communications testing units for use with telephone loops, telephone trunks, pabx loops, pabx trunks, pair gain apparatuses, fair gain loops, data circuits and structural components thereof, cellular radio circuits, satellite circuits and analog and digital transmission facilities

Electronic Communications Testing Units for Use with Telephone Loops, Telephone Trunks, PABX Loops, PABX Trunks, Pair Gain Apparatuses, Pair Gain Loops, Data Circuits and Structural Components Thereof, Cellular Radio Circuits, Satellite Circuits, and Analog and Digital Transmission Facilities