Patente
See https://patents.google.com/?assignee=Oldenkott&country=DE --Magna (talk) 04:43, 21 December 2020 (CST)
Logos
See http://www.pipephil.eu/logos/en/logo-oldenkott.html Magna (talk)
See https://patents.google.com/?assignee=Oldenkott&country=DE --Magna (talk) 04:43, 21 December 2020 (CST)
See http://www.pipephil.eu/logos/en/logo-oldenkott.html Magna (talk)