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Gros ouvrage du Pas du Roc: block 4 was armed with four 81 mm mortars and one 50 mm mortar. It covered both the Col du Fréjus and the Col de la Roue.
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Gros ouvrage du Pas du Roc: block 4 was armed with four 81 mm mortars and one 50 mm mortar. It covered both the Col du Fréjus and the Col de la Roue.
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