D1C.2: Tightness of distribution pipes (Kooiman, Arie; Lueb, Sander)
D1C.4: Domestic pressure regulators (Kooiman, Arie)
D1C.6: Development of 100%-hydrogen compatible domestic components (Rijpkema, H.J.M.; Salomons, H.)
D2.2: Influence of sulfur containing odorant on end use appliances (Vlap, Harm)