Loudspeakers, without housing, having a frequency range of 300 Hz to 3, 4 KHz with a diameter not exceeding 50 mm for telecommunication use, cone type. 10%--305. 8518 29 00. Loudspeakers, without housing, having a frequency range of 300 Hz to 3, 4 KHz with a diameter not exceeding 50 mm for telecommunication use, other than cone type. 10%--306