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| Number | Title | Issue Date |
| 3940620 | Electrostatic recording of X-ray images A device for the electrostatic recording of X-ray images comprises two spaced electrodes with a gas-filled gap therebetween. One of the electrodes comprises a layer of an ultraviolet emitting fluorescent material and a layer of an air-exposable ultraviole... | 02/24/1976 |
| 3937964 | Scintillation camera with second order resolution A scintillation camera for use in radioisotope imaging to determine the concentration of radionuclides in a two-dimensional area in which means is provided for second order positional resolution. The phototubes, which normally provide only a single order ... | 02/10/1976 |
| 3936687 | Photocathode with plurality of concentric conducting rings A flat large-area photocathode intended for use in an intensifier tube is constructed so that a pre-determined potential gradient can be maintained across its surface in operation in order to simplify the electron-optical system of the intensifier. This i... | 02/03/1976 |
