(xviii) Metals, waste, or scraps of beryllium or beryllium  alloys, or beryllium compounds, or primary or semi- finished products thereof (excluding primary or semi- finished products of beryllium oxide used in electronics  parts)  (xix) Substances used as alpha sources for the  detonation of nuclear weapons, or raw materials  therefor (excluding those listed in (i) above)  (xx) Boron-10  (xxi) Substances used as reducing or oxidizing agents  for the production of nuclear fuel materials  (xxii) Crucibles made with materials which are  corrosion-resistant against actinide  (xxiii) Metals, waste or scraps of hafnium or hafnium  alloys, or hafnium compounds, or primary or semi- finished products thereof  (xxiv) Metals, waste or scraps of lithium or lithium  alloys, lithium compounds or mixtures containing  lithium, or primary or semi-finished products thereof  (xxv) Primary products of tungsten, tungsten carbide or  alloys (limited to those that have cylindrical or  hemispherical shapes or a combination of both shapes)  (xxvi) Metals, waste, or scraps of zirconium or  zirconium alloys, or zirconium compounds, or primary  or semi-finished products thereof  (xxvii) Electrolytic cells for fluorine production  (xxviii) Equipment for the production or assembly of gas  centrifuge rotors, or components therefor  (xxix) Centrifugal balancing machines (excluding  single-plane balancing machines)  (xxx) Filament winding machines, or components or  controllers therefor  (xxxi) Gas laser oscillators, solid-state laser oscillators,  or dye laser oscillators usable for the separation of  uranium isotopes  (xxxii) Mass spectrometers or ion sources usable for the  analysis of nuclear fuel materials  (xxxiii) Pressure gauges or bellows valves using  materials which are corrosion-resistant against  uranium hexafluoride (excluding those listed in the  middle column of row 3)  (xxxiv) Superconducting solenoid electromagnets  (xxxv) Vacuum pumps used in separators for uranium  isotopes (excluding those listed in the middle column of  row 3)  (xxxv)-2 Scroll-type compressors or vacuum pumps that  use bellows seals (excluding those listed in (xxxv) and  the middle column of row 3)  (xxxvi) Direct current power units with lower  fluctuations of voltage and current  54 