The use of slide rules continued to grow through the 1950s and 1960s even as computers were being gradually introduced; but around 1974 the handheld electronic scientific calculator made them largely obsolete and most suppliers left the business.
Penggunaan mistar hitung terus berkembang sampai tahun 1950-an dan 1960-an bahkan saat komputer diperkenalkan secara bertahap; tapi sekitar tahun 1974 kalkulator ilmiah elektronik genggam membuat mistar hitung sangat usang dan sebagian besar pemasok meninggalkan bisnis.