"Elinvar is a trademark for a kind of steel used for watch springs because its elasticity is constant over a wide range of temperatures"@en-us . . . . "Elinvar"@en-us . "0"^^ . . "chrome-nickel steel"@en-us . . "chrome-nickel steel"^^ . "0"^^ . "113967338"@en-us . . "110624894"@en-us . "114810854"^^ . . . . "14810854-n"^^ . .