Acoustic apparatus for reproducing sound,Acoustic receivers for telephonic communication with computers,Adaptors for converting alternating current to direct current,Adaptors for converting direct current to alternating current,Adaptors for use with electric plugs,Add-in cards for micro computers,Add-on circuit boards,Add-on-cards for computers,Aerial amplifiers,Aerial boosters,Aerial sockets,Aerials for telecommunications,Aerials for the reception of signals,Aerials for the transmission of s...