(587.
1588.
32
(b) High speed cameras in which the film does not move, and which are capable of recording at rates excceding 250,000 frames per second for the full framing height of standard 35 mm. wide photographic film, or proportionately higher rates for lesser frame heights, or proportionately lower rales for greater frame heights;
(2) Cameras Incorporating image converters and specially
designed controls, parts and accessories therefor;
(d) Photographic systems specially designed for use in space
vehicles.
(2) Streak cameras having writing speeds of & mm./microsecond and above capable of recording events which are nol initiated by the camera mechanism.
(A) Cameras having shutter speeds of less than I microsecond per operation, and specialized parts and accessories therefor; (g) High speed film, as follows-
() Raving an intensity dynamic range of 1,000,000 : 1
or mare; or
(i) Having a speed of ASA. 10,000 (or its equivalent) or better.
Quartz crystals and assemblies thereof in any stage of fabrica tion (ie, worked, semi-finished or mounted), as follows-
(d) For use as filter elements—
(1) Specially designed crystals; or
(i) Assemblies of crystals;
(6) For use as oscillator elements —
(1) Designed for operation over a temperature range wider than 190 divisions in Fahrenheit/100 divisions in Celsius and capable of operating above 185' F./85° C; (i) Designed for a frequency stability of plus or minus 0.003% or better over the rated temperature range;
(iii) Mounted in metal holders sealed with thermocompres- sion welding; or
(iv) Capable, when mounted, of being passed through a circular hole with a diameter of 0.42 inches (10.7 mm.).
Materials composed of crystals having spinel, hexagonal or garnet crystal structures; thin film devices; assemblies of the foregoing; and devices containing them, as follows
(6) Monocrystals of Ferrites and gamets, synthetic only;
(6) Single aperture forms possessing any of the following
characteristics—
(1) Switching speed of 0.5 microsecond or faster at the minimum field strength required for switching at 104 F. (40° C)
(1) A maximum dimension less than 45 mils (1.14 mm.);
1595
1601,
33
(c) Multi-aperture forms with fewer than 10 apertures possess.
ing any of the following characteristics—
(1) Switching speed of 1 microsecond or faster at the minimum field strength required for switching at 104° F.
(40° C);
(0) A maximum dimension less than 100 mils (2.54 mm-); (d) Multi-aperture forms having 10 or more apertures; (e) Thin film memory storage or switching devices;
(f) Electrical filters in which the coupling element makes use
of the electromechanical properties of ferrites;
(r) Materials suitable for application in electromagnetic devices
making use of the gyromagnetic resonance phenomenon.
Gravity meters (gravimeters) and specialized parts therefor designed or modified for airborne or marina we,
GROUP H.
METAL, MINERALS AND THEIR MANUFACTURES.
In this Group-
Kaw materials cover all materials from which the metal can be usefully extracted, i. ores, concentrates, matte, regulus, residues and dross (ashes); and
Unless provision to the contrary is made in particular itentk of the definition, the words metal and alloys cover all crude and semi-fabricated forms as follows-
Crude forms:
Anoder, balls, bars (including notched bars and wire bars), billets, blocks, blooms, brickets, cakes, cathodes, crystals, cubes, dice, grains, granules, ingots, lumps, pellets, pigs, powder, rondesles, shot, slabs, slugs, sponge, sticks.
Semi-fabricated forms (whether or not coated, plated, drilled or punched):
(a) Wrought or worked materials fabricated by colling, drawing, extruding, forging, impact extruding, pressing. graining, atomizing and grinding, ie, angles, channels, circles, discs, dust, flakes, foil and leaf, forgings, plates, powder, pressings and stampings, ribbons, rings, rods (including bare welding rods, wire rods and rolled wire), sections, shapes, sheets, strip, pipe and tubes (including tube rounds, squares and hollows), drawn or extruded wice.
(6) Cast material produced by casting in sand, die, metal, plaster or other types of moulds, including high pressure castings, sintered forms, and forms made by powder metallurgy.
Anti-friction bearings, as follows-
(4) All bail and cylindrical roller bearings having an inner bore diameter of 10 millimeters or less and tolerances of