Commodity200520062007200820092010
Dictating machines not capable of op. without an ext. source of power$40,142$191,941$339,723$240,111  
Telephone answering machines$5,073$9,813  $24,805$279
Magnetic tape recorders incorp. sound repr. app., n.e.s. in 85.20$77,519$175,763$215,058$439,064  
Sound recording app., whether or not incorp. a sound repr. device, n.e.s. i ...$94,348$98,468$88,517$92,705  
Total$217,082$475,985$643,298$771,880$24,805$279