MINING TOOLS EQUIPMENT. Early MSA SelfRescuer. German SelfRescuer Hardsocg Mfg. Co. Ottumwa, IA. Hardy Patent Pick Co. Ltd. Great Britain. Patent Pick with Replaceable Points. Patent Pick. Friemann Wolf Bench Magnet for Opening Safety Lamp Locks 1928 Ringrose Firedamp Detector Great Britain. Hardsocg Mfg. Co. Ottumwa, IA. Dagostyle Hammer set of 4 hand drill .