These were plain hunters knives (couteau de chasse), renamed trench knives (couteau de tranchée) for the purpose, in 1914 they were given to infantry soldiers, but the number was soon unsufficient and if practical to cut bread, they were unefficient in hand to hand fights, so soldiers were later equipped with fixed kitchen knives or with the famous "Vengeur"..
these examples were made by the Manufacture d'Armes et Cycles de St-Etienne
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a team of "trench cleaners" (Equipe SZ, 290è R.I. (section "Zigouilleurs" ) cf/https://www.tircollection.com/t32241-armes-blanches-des-nettoyeurs-de-tranchees-ww1
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Thanks for this interesting information along with the fascinating and a bit haunting picture of the soldiers.