Various
Standard of the International Organization for Standardization (ISO) that defines the quality of the product in the production, installation and service stages.
Today the standard includes also ISO 9002 ( ) and ISO 9003

The standard title (quoted from its latest version of 2015):
ISO 9001:2015 specifies requirements for a quality management system when an organization:

a) needs to demonstrate its ability to consistently provide products and services that meet customer and applicable statutory and regulatory requirements, and

b) aims to enhance customer satisfaction through the effective application of the system, including processes for improvement of the system and the assurance of conformity to customer and applicable statutory and regulatory requirements.

All the requirements of ISO 9001:2015 are generic and are intended to be applicable to any organization, regardless of its type or size, or the products and services it provides.

Download the standard from the ISO site (payment) https://www.iso.org/standard/62085.html

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
There are 1 manhole covers in the site that has this standard
Click for all the covers with this standard

Click for the rest of the standards in the site

The ultimate manhole covers site

Initiating the site - Eli Zvuluny - Programming and building the site Possible Worlds Ltd. Possible Worlds Ltd. © 2017-2018

© ALL RIGHTS RESERVED - The site and its content are copyright protected. The full copyrights of the site's content belong to Eli Zvuluny. All images in the site (unless another photographer is mentioned) were taken by Eli Zvuluny that has the full copyrights on them. The use of any images or other materials included herein, in whole or part, for any purpose is expressly prohibited without the written permission of Eli Zvuluny. .