"bal - agen
- accumulator insulator
- accumulator metal
- accumulator station
- accuracy to gauge
- accuracy to size
- accurate grinding
- accurate lattice-parameter determination method
- accurate measurement
- accurate measurement of interplanar spacings
- accurate to gauge
- ACD
- acetylene (pipe) line
- acetylene cutter
- acetylene drying device
- acetylene feather
- acetylene generating room
- acetylene lime
- acetylene manifold
- acetylene purifying device
- acetylene supply
- acetylene torch valve
- acetylene-air flame
- acetylenic corrosion inhibitor
- achromat lens
- achromatic object glass
- achromatism of radiation
- ACI
- acicular
- acicular bismuth
- acicular ferrite
- acicular ferrite steels
- acicular iron
- acicular iron ore
- acicular powder
- aciculite
- acid
- acid anhydride
- acid Bessemer converter
- acid Bessemer process
- acid Bessemer steel