Importation and Exportation.
Radio-frequency signal generators, being screened electric oscillators associated with attenuators of a kind used to provide signals having frequencies exceeding three hundred megacycles per second and magnitude less than one microwatt or ten millivolts peak value; and specialized parts of such generators.
Balances, electronic, capable of detecting differences in weight smaller than ten microgrammes; and specialized parts of such balances.
Resistors temperature-sensitive, of a kind used in bolometers or in the measurement of electric power below ten milliwatts, but not including electric lamps.
Apparatus for detecting or locating objects under water (excluding specific civil items; e.g., apparatus for detecting shoals of fish).
Location apparatus of a kind used for detecting objects or for determining the relative direction position or motion of objects by means of the constant velocity or rectilinear-propagation characteristics of electromagnetic waves having frequencies between 108 cycles per second (3 meters-100 megacycles) and 4 × 1014 (0.75 microns); and specialized parts and accessories of such apparatus; and specialized equipment for testing or calibrating such apparatus. Radar and radio navigation equipment (other than direction-finders) operating at frequencies below one hundred megacycles per second.
Pulse modulators capable of providing electric impulses of peak power exceeding ten kilowatts; and pulse-transformers and pulse-forming equipment being specialized parts of such modulators.
Electromagnetic waveguides, resonant circuits radiators of a kind used at frequencies exceeding six hundred megacycles per second; and articles or equipment incorporating, or designed to be connected to or to be incorporated in any such item.
Communication equipment of a kind using infra-red radiation or ultrasonic waves; and specialized parts thereof.
Apparatus of a kind used to jam or otherwise interfere with radio reception, and specialized parts of such apparatus.
Communication equipment of a kind exclusively designed for use in aircraft; and specialized parts of such equipment.
Radio receivers panoramic, being receivers which search automatically a part of the radio-frequency spectrum and indicate visibly the signals received, and specialized parts of such receivers.
Telecontrol-equipment suitable for controlling pilotless aircraft and guided weapons.
Cathode-ray oscilloscopes with time basis shorter than two microseconds; and specialized parts of such apparatus.
Photomultiplier tubes and specialized parts thereof.
Valves, thermionic of a kind used with a potential difference exceeding nine thousand volts between electrodes, or of a kind used at frequencies exceeding two hundred and fifty megacycles per second, or of a kind that can be passed through a circular hole one-half inch in diameter; and specialized parts of such valves.
Crystal rectifiers of a kind used at frequencies exceeding three thousand megacycles per second, and specialized parts of such rectifiers.
Cables of very low attenuation and high uniformity as used for frequencies of the order of magnitude of 3,000 mc/s and above.
Design data, manufacturing technique and specialized tools for making any controlled items.
Amplifiers, high gain, stable linear pulse designed to operate within the range of 50 cycles per second to 10 megacycles per second and of input resistance not less than 10 megohms.
Electrometers, except student type.
297
[CAP. 50
Importation and Exportation.
Radio-frequency signal generators, being screened electric oscillators associated with attenuators of a kind used to provide signals having frequencies exceeding three hundred megacycles per second and magnitude less than one microwatt or ten millivolts peak value; and specialized parts of such generators.
Balances, electronic, capable of detecting differences in weight smaller than ten microgrammes; and specialized parts of such balances.
Resistors temperature-sensitive, of a kind used in bolometers or in the measurement of electric power below ten milliwatts, but not including electric lamps.
Apparatus for detecting or locating objects under water (ex- cluding specific civil items; e.g., apparatus for detecting shoals of fish).
Location apparatus of a kind used for detecting objects or for determining the relative direction position or motion of objects by means of the constant velocity or rectilinear-propagation charac- teristics of electromagnetic waves having frequencies between 108 cycles per second (3 meters-100 megacycles) and 4 × 1014 (0.75 microns); and specialized parts and accessories of such apparatus; and specialized equipment for testing or calibrating such apparatus. Radar and radio navigation equipment (other than direction- finders) operating at frequencies below one hundred megacycles per second.
Pulse modulators capable of providing electric impulses of peak power exceeding ten kilowatts; and pulse-transformers and pulse- forming equipment being specialized parts of such modulators.
Electromagnetic waveguides, resonant circuits radiators of a kind used at frequencies exceeding six hundred megacycles per second; and articles or equipment incorporating, or designed to be connected to or to be incorporated in any such item.
Communication equipment of a kind using infra-red radiation or ultrasonic waves; and specialized parts thereof.
Apparatus of a kind used to jam or otherwise interfere with radio reception, and specialized parts of such apparatus.
Communication equipment of a kind exclusively designed for use in aircraft; and specialized parts of such equipment.
Radio receivers panoramic, being receivers which search auto- matically a part of the radio-frequency spectrum and indicate visibly the signals received, and specialized parts of such receivers.
Telecontrol-equipment suitable for controlling pilotless aircraft and guided weapons.
Cathode-ray oscilloscopes with time basis shorter than two microseconds; and specialized parts of such apparatus.
Photomultiplier tubes and specialized parts thereof.
Valves, thermionic of a kind used with a potential difference exceeding nine thousand volts between electrodes, or of a kind used at frequencies exceeding two hundred and fifty megacycles per second, or of a kind that can be passed through a circular hole one-half inch in diameter; and specialized parts of such valves.
Crystal rectifiers of a kind used at frequencies exceeding three thousand megacycles per second, and specialized parts of such rectifiers.
Cables of very low attenuation and high uniformity as used for frequencies of the order of magnitude of 3,000 mc/s and above. Design data, manufacturing technique and specialized tools for making any controlled items.
Amplifiers, high gain, stable linear pulse designed to operate within the range of 50 cycles per second to 10 megacycles per second and of input resistance not less than 10 megohms.
Electrometers, except student type.
297
[CAP. 50
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