Copper
Cadmium
Chromium
Lead
Old sedimentary
Old igneous
Old metamorphic
New metamorphic
Nichrome
Tungsten
Graphite
Iron
Oxygen, acetylene and argon
Oxygen and acetylene
Oxygen, hydrogen, acetylene and nitrogen
Oxygen and hydrogen
National service
Regional service
International service
Overseas communication services
Alpha ray
Beta ray
Cathode ray
Gamma ray
Zinc
Uranium
Mercury
Radium
Constant pressure but variable temperature
Constant temperature
Constant temperature and pressure
Constant pressure
Multimeter
Frequency meter
Meggar
None of these
Ruby
Emerald
Diamond
Sapphire