Electromechanical non-specified time all-or-nothing relays of assessed quality - Part 1: Generic specification (IEC 61811-1:1999); German version EN 61811-1:1999— 8 стр.
Sampling procedures for inspection by attributes; sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection; identical with ISO 2859-1:1989— 72 стр.