其他書名 | Microphones, Loudspeakers, and Electric Sound and Visual Signaling Apparatus : TSUS Items 684.70-684.72, and 685.70-685.72 |
出版 | U.S. International Trade Commission, 1984 |
URL | http://books.google.com.hk/books?id=IZxZDe1S5csC&hl=&source=gbs_api |
EBook | FULL_PUBLIC_DOMAIN |