1075.
1060.
1081.
1080.
1089.
1091.
10
(d) Isostatic presses, as follows-
(1) Capable of achieving a maximum working pressure of 20,000 psi. (1,406 kg/cm2) or greater and possessing a chamber cavity with an inside diameter in excess of 16 inches (40.6 cm.), or
(i) Capable of achieving a maximum working pressure of 5,000 psi. (351 kg/cm2) or greater and having a controlled thermal environment within the closed cavity, except those possessing a chamber cavity with an inside diameter of less than 5 inches (127 mm.) and which are also capable of Bchieving and maintaining a controlled thermal environment only between +176°F. (+80°C) and −1°F (-35°C); (e) Control equipment, accessories and parts which are specially
designed for the above pressed.
Spin-forming machines, except those with a spindle drive motor of less than 50 horse-power.
Machines and squipment specially designed for making or measuring gas turbine blades.
Machinery for use in the manufacture of aircraft, as follows- (a) Machinery specially designed for the working or forming of
aircraft sheet, plate or extrusion;
(b) Machinery specially designed for the milling of aircraft skin.
Machines specially designed for the manufacture of jet engines, as follows-
(a) Jet engine compressor case boring machinest
(b) Tet eagino compressor or turbine disc turning machines; (c) Jet engine rotor grinders.
Gear making, gear finishing machinery or both, as follows- (a) Gear grinding machines, generating type, capable of accept- ing gear blanks of 36 toches (914 mm) work diameter or more:
(b) Cicar grinding machines, generating type, designed to grindİ gear to a face-width of 7 inches (177 mm) or more for production of helical or berring bono gears;
(c) Capable of the production of gears of a module Aner than 0.5 millimetres (diametral pitch finer than 48) and meeting e quality standard better than DIN 58405 Class 7.
Numerical control systems, as follows-
(@) Numerical control systems specially designed for control- ling co-ordinated simultaneous (contouring and continuoUS path) machining movements in a machine tool in 2 or more exc; and machine tools designed for or equipped with such controls;
(6) Numerical control servo-driven measuring or gauging ma- chines specially designed for measuring at any point of the contout the dimensional shape and contour characteristics of two or three-dimensional objects Including objects of revolution.
1092.
J110.
Tracer controlled machine tools, as follows-
(a) Milling and boring machines with an accuracy of +0001 inch (+0.025 mum.) and a repeatability of +0.0005 inch (+0.0125 mm.) or better;
(b) Lathes with an accuracy of +0.0004 inch (+0.01 mm) and a repeatability of ± 0.0002 inch (+0.005 mm.) or betters (c) Specialized accessories and components for the above.
GROUP B.
CHEMICAL AND PETROLEUM EQUIPMENT.
Gas liquefying equipment, as follows-
(a) Equipment for the Fractional separation of air into its various components, except helium, which has been specially de- signed for the withdrawal of liquid end-products to the total amount of 60 tons or more per 24-hour day, provided that the withdrawal of liquid oxygen or nitrogen cxceeds $0 tons per 24-hour day, except plants not capable of pro- ducing more than 15% of their total daily product as ex- tractable gas in liquid form, provided that the withdrawal of liquid oxygen or nitrogen does not exceed 12.3% of their total daily product;
(b) Equipment for the production of liquid hydrogen, except plants with a capacity of less than 14 tons per 24-hour day and not designed for, or capable of, the production of hydro- Ren slush;
(c)
Liquid fluorine producing equipment; (4) Equipment for helium as follows-
(1) Equipment for the separation of helium from natural gases; and
(i) Equipment for the production of liquid helium, except equipment which has a capacity of no more than 20 litres per hour.
Equipment for the production of military explosives and solid propellants, as follows....
116.
(a) Complete installations:
(b) Specialized components:
1129.
(e) Nitrators: continuous types.
Vacuum pumps, as follow
(4) Ion vacuum pumps (ie, those using the principle of ioniza- tion) except those having pumping speeds of less than 800 litres of hydrogen per second at a pressure of 10-5 milli- metres of mercury or more (ie. 10–3, 10–4, etc.);
(6) Turbo-molecular purops having a higher capacity than
2,000 litres of nitrogen per second;
(e) Diffusion pumps rated for unbaffled pumping speeds of more than 50,000 litres of nitrogen per second at pressures of 10-4 millimetres of mercury or less;