1960-HKRS30-8-50_Part05 — Page 21

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per second having a plate dissipation in excess of 10 Watts under any conditions of cooling and all valves designed for use at frequencies in excess of 500 megacycles per second;

(b) Indirectly heated valves of a kind that can be passed through a circular hole of 7.2 millimetres in diameter:

(c) Valves designed to withstand at least one of the

following tests:

(1) Sinusoidal vibration at peak accelerations greater than Sg for a total period in excess of 100 hours at any one frequency between 25 and 170 cycles per second:

(2) Swept frequency sinusoidal

vibrations

between 60 and 1,000 cycles per second. with a minimum swept frequency ratio of 5 to 1, at a peak acceleration greater than 4 g for a total period in excess of 200 hours. (3) Acceleration of short duration (shock)

greater than 1,000 g:

(d) Valves constructed with ceramic envelopes and designed for frequencies in excess of 60 mega- cycles per second;

(e) Valves designed for operation in ambient

temperatures exceeding 100°C.

(f) Klystrons;

(g) Travelling wave tubes.";

(g) by the addition at the end thereof of the following new items- "44. Dendritic produced forms of any semi-conductor material. or combinations thereof, suitable for use in diodes or transistors.

45. Thermal detecting cells, Le. bolometers and thermo- couple detectors, radiant energy types only, with a response time constant of less than 10 milliseconds measured at the operating temperature of the cell for which the time constant reaches a minimum.

46. Electronic equipment and components, not elsewhere

specified, as follows:

(2) Assemblies and sub-assemblies constituting one or more functional circuits with a component density greater than 75 parts per cubic inch (4.575 parts per cubic centimetre), and equipment containing such assembly or sub-assembly:

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(6) Modular insulator panels (including wafers) mounting single or multiple electronic elements and specialized parts therefor.".

1. The Schedule to the principal regulations is amended under Amendment the heading “GROUP H'*—

(0) by the deletion of item 4(a)(2) and the substitution therefor

of the following-

"(2) 6 per cent or more cobalt except;

(i) Permanent magnetic metals with a cobalt content

of 25 per cent or less;

(1) High speed tool steels containing up to 10 per cent cobalt, less than $ per cent chromium and no nickel; or;

(b) by the addition at the end of item 9 of the following-

"(d) Molybdenum ores, concentrates, oxides and scrap.”.

of Scbedule. (Group B)

8. The Schedule to the principal regulations is amended under Amendment the heading "GROUP 1–

(a) by the deletion of item 3 and the substitution therefor of the

following-

**3. Stabilizers for explosives, as follows :

(a) Ethyl and methyl centralites;

(6) NN-diphenylurea (unsymmetrical diphenylurea); (c) Methyl-NN-diphenylurea (methyl unsymmetrical

diphenylurea);

(d) Ethyl-NN-diphenylurea (ethyl unsymmetrical

diphenylurea):

(e) Erbyl phenyl urethane;

(f) Dipheny! urethane: (g) Diorthotoly-urethane;

(k) 2-Nitrodiphenylamine;

(i) p-Nitromethylaniline.”;

(b) by the deletion of item 4(a) and the substitution therefor of

the following-

"(a) Boron minerals, including but пот limited to Colemanite, Pandermite, Rasorite and Ulexite, crude or refined;";

(e) by the deletion of item 6 and the substitution therefor of the

following-

*6. Hydrazine in concentrations of 70 per cent or more. hydrazine nitrate; unsymmetrical dimethyl hydra- zine.".

of Schedule.

(Group L