The connected records describe German belt-feed hardware rather than a modern company. Bundeswehr material describes the MG3 as a 7.62 mm machine gun fed by a Patronengurt, while parts and surplus sources identify DM1 as a German-origin, non-disintegrating steel belt for HK21 and MG3 use.
The same feed-system context also includes the German DM6 disintegrating-link pattern. Small Arms Review's HK21E coverage distinguishes American M13 and German DM6 disintegrating links from continuous German DM1 belts, which is the practical distinction behind the catalog's German military-pattern attribution.
German ammunition-belt patterns7.62x51 mm NATO machine-gun feed hardwareMG3 and HK21-compatible support equipmentNon-disintegrating and disintegrating metallic links
The name refers to German military-pattern hardware and national-pattern sourcing, not a single legal manufacturer. Where sources identify a company-level maker for a firearm or accessory, that corporate manufacturer should remain on the specific weapon record.