Number | Date | Country | Kind |
---|---|---|---|
3532699 | Sep 1985 | DEX |
Number | Date | Country |
---|---|---|
2058485 | May 1971 | FRX |
Entry |
---|
Optik, Plies et al., 46, No. 1, Sep. 1976, pp. 75-92. |
"Adaptation of a Magnetic Filtering Device on a One Megavolt Electron Microscope", Zanchi et al., Optik, 43, Nov. 1975, No. 5, pp. 455-501. |