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Safety lamp, Mueseler no.33, Somzee's gas detecting device, use: gas detecting, from the Royal Commission on Accidents in Mines 1879-86, marking: Lampe Avertissante du Grisou systeme Somzee, 1853, Base containing bell arrangement (see 2 stroke numbers).
Safety lamp, Mueseler no.33, Somzee's gas detecting device, use: gas detecting, from the Royal Commission on Accidents in Mines 1879-86, marking: Lampe Avertissante du Grisou systeme Somzee, 1853
Base containing bell arrangement for gas detecting, with Safety lamp 1886-207/1
