1965-HKRS30-8-55_Part06 — Page 19

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(b) Turbo-molecular pumps having a higher capacity than 2,000 litres of

nitrogen per second:

(c) Diffusion pumps rated for unbaffled pumping speeds of more than

50.000 litres of nitrogen per second at pressures of 10-4 mm. of mer Cuty or less;

(40) Cryopump systems, not elsewhere specified, (that is, systems in which the circulation of liquefied gas is used to achieve a vacuum (static or dynamic) by lowering the temperature of the environment);

(4) Specially designed parts, controls and accessories for the above pumps.

7. Pipe and tubing made of or lined with polytetrafluoroethylene or polytri-

Aluorochloroethylene.

$. Containers, jacketed only, for the storage or transportation of liquefied gases.

5. Valves, cocks and pressure regulators, not elsewhere specified, as follows-

(4) Specially designed to operate at temperatures below -274°F (17°C);

or

(b) Having all flow contact surfaces made of any of the following material- (i) 90% or more tantalum, titanium or zirconium, either separately or combined;

(1) 50% or more cobalt or molybdenum, either separately or com- bined;

(iii) Polytetrafluoroethylene, polytrifluorochloroethylene; or

(c) Valves less than three centimetres in diameter, with bellows seal, wholly made of or lined with aluminium, nickel, or alloy containing 60% or more nickel, eilber manually or automatically operated, and with other than metal to metal seats.

GROUP C.

ELECTRICAL AND POWER GENERATING EQUIPMENT,

1. Diesel engines, 50 h.p. and over.

2. Bkkelric vacuum furnaces, as follows-

(a) Consumable electrode vacuum are furnaces with a capacity in excess of

5 tons, not elsewhere specified;

(5) Skull type vacuum are furnaces;

(c) Electron beam vacuum furnaces,

(4) Induction vacuum furnaces, as follows-

(i) Cold crucible vacuum induction furnaces designed to operate at pressures lower than 0.1 mm. of mercury and at temperatures higher than 2,012°F, (1,100°C)

(U) Other vacuum induction furnaces designed to operate at tempera- tures higher than 3,002°F. (1,650°C.), excluding furnaces with a work piece space of not more than 13,000 cc. and designed to operate not higher than 3,452°F, (1,900°C), and furnaces with a work piece space of not more than 3,200 cc. with no single dimension (length, width, height or diameter) of that space in excess of 10 inches, and designed to operate at temperatures not higher than 4,172°F. (2,300°C)

(e) Resistance vacuum furnaces designed to operate at temperatures higher than 3,002 F. (1,650°C.); excluding furnaces up to 12 in. x 12 in. x 12 fn. (28,320 c.a) designed for boaf treatment, or 3,200 c.c. designed for melting temperatures not higher than 4,172°F. (2,300°C) for both types; (A) Specialized parts and controls for the above furnaces,

3. Electron beam equipment, as follows-

(0) Welding and/or machining equipment,

(b) Equipment for the deposition of thin film, the coating of thin film, or

the working theroof;

(c) Specialized parts for the above equipment.

4. Electro-chemical. semi-conductor and radioactive devices, not elsewhere specified, for the direct conversion of chemical, solar or nuclear energy to electrical energy, as follows-

(a) Electro-chemical devices, as follows-

0) Fuel cells, including regenerative cells, ie. cells for generating electric power, to which all the consumable components are supplied from outside the cell;

(ii) Electrically rechargeable cells, hermetically sealed, designed to have a leakage rate of 10-5 cc. per second of gas or less when tested under a pressure differential of 2 atmospheres:

(8) Primary cells having any of the following characteristics—

(1) Possessing a means of activation and having an open circuit storage life in ìbe unactivated condition, at a temperature of 70°F. (21°C), of 10 years or more:

13°F.

(2) Capable of operating at temperatures from below -25°C.) to above 131°F. (55°C.), including cells and cell assemblies (other than dry cells) possessing self-contained heuters:

(6) Photo-voltaic cells, not elsewhere specified, with a power output of 8 milliwalls or more per square centimetre under 100 milliwatts per square centimetre tungsten (2,800 K) illumination; all gallium arsenide photo- voltaic cells, excluding those having a power output of less than 4 milliwatts measured by the above technique:

(c) Power sources other than nuclear reactors based on radioactive materials systems, excluding those having a power outpart of less than 0.5 Watt in which the ratio of output fin Wafts) to weight (in pounds) is less than ❘ to 2;

(d) Specialized parts, components and sub-assemblies of the above devices.

5. Electric are devices, not clawhere specified, for generating a flow of ionized gas in which the arc column is constricted (except devices wherein the dow of gas is for isolation purposes only); equipment incorporating such devices; specially designed parts, accessories and control or test equipment, not else- where specified, for such devices.

GROUP D.

GENERAL INDUSTRIAL EQUIPMENT.

The following, including spare parts and components therefor-

1. Cable-making machinery specially designed for making multipair and/or

coaxial electric cables.