| http://www.w3.org/ns/prov#value | - Theoretically, one could, at that time, have chosen nitrogen (N2), carbon dioxide (CO2), carbon monoxide (CO), phosgene (COCl2), chlorine (Cl2), hydrogen cyanide (HCN), nerve gases such as Tabun and Sarin, Diesel engine exhaust, internal combustion engine exhaust, producer gas, coke or city gas, or process gas.
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