1

Sound collecting system and sound reproducing system

Year:
1995
Language:
english
File:
PDF, 110 KB
english, 1995
2

Acoustic signal reproducing apparatus

Year:
1993
Language:
english
File:
PDF, 87 KB
english, 1993
3

Induction speaker

Year:
1992
Language:
english
File:
PDF, 149 KB
english, 1992
4

Earphone device

Year:
1994
Language:
english
File:
PDF, 125 KB
english, 1994
5

Hearing aid

Year:
1993
Language:
english
File:
PDF, 143 KB
english, 1993