hard-chine
hardcopy
hard-drawn
harden
hardenability
hardener
hardening
hard-ening-and-annealing
hard-grain
hard-landing
  hardness
hardness-testing
hard-nosed
hardometer
hard-over
hardover
hard-point
hard-rock
hard-sphere
hard-textured
hard-to-detect

    hardness test

     испытание на твердость

     испытание твердости

     определение твердости

     проба на твердость