# ISO/R 226:1961 — Withdrawn and superseded ISO standards

For ISO/R 226:1961, item title is Normal equal-loudness contours for pure tones and normal threshold of hearing under free field listening conditions; status code is 9599; successor is ISO 226:1987; withdrawn / published date is 1961-12-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO/R 226:1961 _(verified: appears in the quote below)_
- **Item title:** Normal equal-loudness contours for pure tones and normal threshold of hearing under free field listening conditions _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 226:1987
- **Withdrawn / published date:** 1961-12-01 _(verified: appears in the quote below)_

## What the source says

> 4099,R,,ISO/R 226:1961,Normal equal-loudness contours for pure tones and normal threshold of hearing under free field listening conditions,Lignes isosoniques normales pour sons purs écoutés en champ libre et seuil d'audition binauriculaire en champ libre,1961-12-01,1,['13.140'],ISO/TC 43,9599,,[4100],"['en','fr']",8,

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).