Standard Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures Ingestion-build-93833 These are filters and eye-protectors

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1   This part of IEC 61260 describes procedures for periodic testing of octave-band and fractional-octave-band filters that were designed to conform to the class 1 or class 2 specifications given in IEC 61260‑1:2014

Standard Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures Ingestion-build-93833 These are filters and eye-protectors