2 Spin forming machines.
3. Presses and specialized controls, accessories and parts therefor, as follows- (2) Presses (stabilized equipment using rams) for applying high impact energy work forces through use of explosives or compressed gases including air;
(b) Presses specially designed or re-designed for the working or forming of metals, alloys or other materials with a melting point exceeding 1,900°C:
(c) Prestes, mechanical and hydraulic, not elsewhere specified, with total
rated forces of over 10,000 tons;
(d) Control equipment, accessories and parts which are specially designed
for the above presses.
4. Machines and equipment specially designed for making or measuring gas
turbine blades, including but not limited to the following
(a) Blade belt grinding machines;
(6) Blade edge radiusing machines;
(c) Blade aerofoil milling and/or grinding machines;
(0) Blade Allot radiusing and/or platform forming machines or equipment,
(e) Blade root milling machines;
( Blade blank pre-forming machines;
(g) Blade rolling machines;
(4) Blade aerofoil shaping machines;
(0) Blade root grinding machines;
(1) Blade aerofoil scribing equipment;
(*) Blade aerofoil and/or root automatic measuring equipment.
5. Machinery for use in the manufacture of aircraft, as follows-
(a) Machinery specially desgined for the working or forming of aircraft
sheet, plate or extrusion;
(6) Machinery specially designed for the milling of aircraft skin.
6. Machines specially designed for the manufacture of jet engines, the fallow-
ing
(a) Jet engine compressor case boring machines;
(6) Jet engine compressor or turbine disc turning machines,
(c) Jet engine rotor grinders.
7. Gear making and/or finishing machinery, as follows-
(0) Gear grinding machines, generating type, of 36 inches work diameter
or more
(5) Capable of the production of gears of a module finer than 0.5 mm.
(diametral pitch finer than 48).
8. Metal rolling mills, all types.
9. Electronic closed loop feed back systems capable of controlling, and of continuously correcting, continuous path metal cutting and/or metal form- ing contour operations; and metal-working machine tools designed for or equipped with such controls.
GROUP B.
CHEMICAL AND METALLURGICAL PLANT, FURNACES. PUMPS, PALVES, ETC.
The following, including spare parts and components therefor-
1. Counter current solvent extractors, such as pulsed colurans and mixer- settlers made of stainless steel, specially designed for extracting radioactive substances.
2. Gas liquefying equipmenL
3. Equipment for production andfor concentration of deuterium oxide.
4. Equipment for the production of military explosives and solid propeland,
a follow-
(0) Complete installations;
(6) Specialized components, including-
(i) Dehydration presses;
() Extrusion presses for the extrusion of smell arms, canson and rocket propellants;
(i) Cutting machines for the sizing of extruded propellants;
(ir) Sweetie barrels (tumblers) & feel and over in diameter and having over 500 pounds product capacity:
(V) Continuous mixers for solid propellants:
(c) Nitrators; continuous types.
5. Pumps (except vacuum pumpa) delivering liquids separately or in com- bination with solids and/or gases and having any of the following charac- teristics--
(4) Designed to move molten metals by electromagnetic forces;
(b) Specially designed for operation at temperatures below -274°F. (−170°C) *xœpt pumps with a low rate of 100 gallons (379 litres) per minute or less which are not designed for operation al temperatures below 328 F. (~200°C.)
(4) Having all flow contact surfaces made of any of the following
materials-
() 90% or more tantalum, titanium or zirconium, either separately or combined;
(i) 50% or more cobalt or molybdenum, either separately or com- bined;
(i) Polytetraduoroethylene, polytrifluorochloroethylene.
6. Vacuum pumps, as follows-
(a) Ion vacuum pumps (that is, those using the principle of ionization) except those having pumping speeds of less than 800 litres of hydrogen per second at a pressure of 10-6 mm of mercury or more (that is, 10-5, 10-4, ekki