Commodity2005200620072008200920102011
Dictating machines not capable of op. without an ext. source of power$304,349$356,233$96,631    
Telephone answering machines$179,389$263,755$64,164$79,069$38,308$1,532$469
Magnetic tape recorders incorp. sound repr. app., n.e.s. in 85.20$296,856$699,158$259,009    
Sound recording app., whether or not incorp. a sound repr. device, n.e.s. i ...$3,393,435$1,335,914$3,073,674    
Total$4,174,029$2,655,060$3,493,478$79,069$38,308$1,532$469