6
(c) Transmitting magnetic compasses.
(d) Gyro magnetic compasses.
(e) Gyro stabilizers,
() Automatic pilots.
() Gyroscopic steering controls of all types.
(4) Integrated flight instrument systems for aircraft.
GROUP G.
ELECTRONICS AND PRECISION INSTRUMENTS.
1. Communication, pavigational aids not elsewhere specified, direction finding
and radar equipment of all kinds.
2. Communications and detection equipment of a kind using infra-red radiation
or ultrasonic waves; and specialized parts therefor.
3. Commmunication equipment employing tropospheric, ionospheric or meteoris scatter phenomena and specially designed sub-assemblies, parts and test equipment therefor.
4. “Jamming" apparatus (Le. apparatus specially designed to jam or otherwise
interfere with radio reception); and specialized parts therefor,
5. Apparatus for detecting or locating objects under water by magnetic or acoustic or ultrasonic methods, and specialized components of such appara- tus, except:
(e) Marine depth sounders of a kind used solely for measuring the depth of water or the distance of submerged objects vertically" below the apparatus.
6. Pulse modulators capable of providing electric impulses of peak power exceeding 150KW or of a duration of less than 1/10th microsecond, and pulse-transformer and pulse-forming equipment, and delay lines being specialized parts of such medulators.
7. Radio receivers, panoramic (being receivers which search automatically a part of the radio-frequency spectrum and indicate the signals received); and specialized parts therefor.
8. Radio transmitters and components.
9. Telemetering and telecontrol equipment suitable for use with aircraft (piloled
or pilotless) and weapons (guided ar unguided),
10. Telegraph equipment, as follows:
(a) Equipment (machines), mechanical electromechanical, or electronic, used to translate the information contained in written or printed text inp electrical waveforms suitable for transmission over communication dir cuits at any speed greater than 200 words per minute or 150 bands. whichever is the leas; equipment operating at a speed of 300 bauds wher the corresponding number of words does not exceed 65 words
per nigute: (4) Equipment designed to accept such electrical waveforms and display the
information from them in visible form;
(c) Specialized component parts and accessories for such equipment 11. Radio relay communications equipment and specialized components and rob-
assemblies therefor.
12. Radio and radar amplifiers except those used in domestic type radio ressivert
13. Line communications transmission equipment.
14. Coaxial-type cables including submarine cables specially designed for tele-
communications purposes including radar.
IS. Commruication cable (including submarine cable) of any type containing more than one pair of conductors and containing any conductor, single or stranded, exceeding 0.66 mm, in diameter,
16. Equipment designed to provide secrecy facilities on either voice of telegraph.
line or radio communication circuits.
17. Electronic instruments, as follows:
(a) Those operating et frequencies in excess of 300 Mc/s.
b) Radio testing equipment.
II. Apparatus for automatically sorting electronic components in respect of
beir electrical characteristics.
19. Radio spectrum analysers and specialized parts of such analysers.
3 Electromagnetic waveguides and components therefor, as follows:
(a) Ferrite waveguide componcals for use at all frequencies:
(b) Rigid waveguides for use at frequencies in excess of 12,500 Mefa. (c) Flexible waveguides of all types.
11. Cathode-ray tubes, as follows:
(0) Specially designed or in use for radar equipment;
(8) With writing speeds of more than 3,000 kilometers per second;
(c) With 3 or more electron guns,
22. Crystal signal diodes and specialized parts therefor.
3. Transistors and specialized parts therefor.
4. Photo cells, as follows:
(0) Photoelectric cells, photo-conductive cells (including photo-transistors and similar cells) with a peak sensitivity at a wave length longer than 12,000 Angstrom:
(6) Photo-transistors (photo-conductive cells including photodiodes) with a response time constant of 1 millisecond or less measured at the operating temperature of the cell for which the time constant reaches a minimum.
25. Photomultiplier tubes, and specialized parts therefor.
K. Flash-discharge type X-ray tubes.
27. Image convecters and electronic storage tubes including memory transformers of radar pictures and ruggedised vidicon-type tubes (excluding commercial standard television broadcasting camera lubes and commercial standard X-ray amplifier tubes).
28. Valves (tubes) electronic, and specialized parts, as follows;
(0) Valves whose output-input ratio at 300 megacyctes per second in 30 per cent or more of the output-input ralio at 20 megacycles per second when measured under the same operating vollages and load impedance:
b) Those of a kind specially designed for use at frequencies of more than
300 megacycles per second;
(c) Indirectly heated valves of a kind that can be passed through a circular
bole 1.2 mm. in diameter;
() (1) Those designed to withstand sinusoidal vibration of grealer than 2 g for continuous periods in excess of 20 hours at frequencies between 25 and 170 cycles per second;
(2) Those designed to withstand acceleration of short duration (shock)
greater than 1,000 g: