High speed compressors for wind tunnels (8,000 revolutions per minute and over; Mach, number of and over),
Turbo blowers having compression ratio of 2 or better,
Artificial graphite.
Quartz crystals and plates.
Valves and cocks with corrosive-resistance lining.
Electrically controlled automatic valves.
Searchlight control units.
Steel Mill Products.
Landing mats for aircraft.
Gilding metal, clad steel for bullet envelopes.
Gun forgings, rough and gun forgings, alloy rough.
Ferro columbium.
Ferro Zirconium.
Chemicals.
5
Pentærythritol and pentaerythritol-tetra-nitrates.
Hexamethylene-tetramine.
Hydrazine Hydrate.
Mercury fulminate, lead azide, lead styphnate and lead
thiocyanate.
Nitro-guanidine.
Hydrogen-peroxide (Over 50 per cent, strength).
Glycols and their compounds.
Silicon Organic Compounds.
Aluminium chloride, anhydrous.
Barium nitrate, barium chromate.
Sodium metallic.
Teflon (Fluoron).
Magnesium silicate (steatite).
Potassium tetroxide.
Calcium permanganate.
Potassium permanganate.
Di-nitro-toluene solids and oils.
Stabilisers for explosives.
(a) ethyl and methyl centralites.
(b) diphenylamine.
(c) N. N-diphenylurea (unsymmetrical diphenylurea).
(d) Methyl-N, N-diphenylurea (methyl unsymmetrical
diphenylurea).
(e) Ethyl-N,N-diphenylurea (ethyl unsymmetrical
diphenylurea).
Ethyl phenyl urethane.
(g) diphenyl urethane.
(A) diortho tolyl urethane,
Chemical Equipment.
Podbielniak extractors.
Compressors delivering liquids or gases at 300 lbs. per square inch ur over.
Gauges for measuring pressures in excess of 100 atmospheres (gauge pressures of 1,470 pounds per square inch or 103 kilograms per square centimetre).
Ammonia oxidation.
(a) Complete installations.
(b) Catalizers suitable for ammonia oxidation.
Hydrogenation.
(a) Complete installations.
(b) Catalizers suitable for hydrogenation.