various tests or exams

chemical symbols continuity operating delinah Ems-Vechte-Kanal helium group gas high-reluctance commutating pole maculatory O-Nitro-P-Phenylenediamine oomiacs oxyacetylene welding equipment paranza plane spar poultry epidemiology rain lamps roof-spaces station limit post strap-shaped subsistit Vickers hardness test Yen Lac