Number | Date | Country | Kind |
---|---|---|---|
53/128218 | Oct 1978 | JPX | |
53/128219 | Oct 1978 | JPX | |
53/143051[U] | Oct 1978 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
1710035 | Thompson | Apr 1929 | |
1958888 | Cromartie | May 1934 | |
3180447 | Huff et al. | Apr 1965 | |
3521010 | Sato | Jul 1970 | |
4064374 | Sato | Dec 1977 |
Number | Date | Country |
---|---|---|
1370930 | Jul 1964 | FRX |
Entry |
---|
RCA Review Mar. 1950, pp. 80-98 High-Efficiency Loud Speakers for Personal Radio Receivers, Olson et al. |