Standard DIN 19012, Publication date: 1970-11 Expendable Flash Lamps; Group Classifications according to Luminous Flux/Time Characteristics

Standard DIN 30699, Publication date: 1970-12 Propan/Butan gaslamps; requirements and testing

Technical rule DVGW G 260, Publication date: 1973-01 Technische Regeln für die Gasbeschaffenheit