Number | Date | Country | Kind |
---|---|---|---|
56/51058 | Apr 1981 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
2191278 | Johnson | Feb 1940 | |
2831394 | Heenan et al. | Apr 1958 | |
3392277 | Dawson | Jul 1968 | |
3743385 | Schaefer | Jul 1973 | |
4039885 | van Boekhold et al. | Aug 1977 | |
4152756 | Wrege et al. | May 1979 | |
4158222 | Cook | Jun 1979 |
Number | Date | Country |
---|---|---|
147676 | Nov 1979 | JPX |
Entry |
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Lamps and Lighting, S. T. Henderson & A. M. Marsden, Thorn Lighting Ltd., pp. 172-179, 488-491, 1972. |