- 1952 - 1959 (Creation)
Level of description
Extent and medium
Name of creator
The AC/28 chronological series contains the records of the Working Group of Production and Logistics Experts on the Conversion of American Drawings. The Working Group was created as a result of a meeting between the National Delegations and the Production and Logistics Division on 11 September 1952 (AC/28-D/1). The purpose was to assemble a group of experts to study the problem of converting US technical drawings to permit the manufacture of US equipment and spare parts in Europe. The meetings of the Working Group were attended by technical experts of the national delegations and a Standing Group Liaison Officer. The Working Group met for the first time on 15 September 1952, and held a total of seven meetings over the next two years, the last being on 18 Dec 1953. During these meetings the group discussed the various challenges in the conversion of US technical drawings, such as the measurement and projection systems used, the different testing standards and the symbols used to represent surface finish. The Working Group also discussed how the conversions could make use of and help implement the standards that were being developed by the emerging International Standards Organization (ISO).The Working Group continued to issue documents containing the converted drawings after its last meeting, with the last document issued on 19 March 1959.
Immediate source of acquisition or transfer
Content and structure area
Scope and content
The AC/28 chronological series includes reports on the meetings of the Working Group, in which the challenges of converting the technical drawings, including measurement and projection systems, different testing standards and symbols used to represent surface finish, were discussed.
The series also includes summaries of recommendations made by the Working Group, in addition to memorandums on imperial to metric conversion scales. Though AC/28 series also consists of many cover letters for the distribution of converted drawings to the nations, the drawings themselves are not included.
Appraisal, destruction and scheduling
System of arrangement
The records in the AC/28 series are assembled by type - Document (D) and Record (R) - and then by number.
Conditions of access and use area
Conditions governing access
NATO publicly disclosed information is available for research and education purposes. Any commercial use requires the written permission of NATO. Please credit the NATO Archives should any documents be used for publication. Guidelines for the proper citation of NATO publicly disclosed information can be found on the NATO Archives website (http://www.nato.int/archives).
Conditions governing reproduction
Language of material
Script of material
Language and script notes
The documents of the chronological series were circulated in both NATO official languages (English and French).