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mm BBM Lennusadam . en mm BBM naval gun in Lennusadam maritime museum Original was submarine deck gun while the BBM was used in surface vessels and as coastal artillery fi mm BBM laivatykki Lennusadaman merimuseossa BBM tykki kytettiin pintaaluksissa ja rannikkotykkin kun alkuperinen tykki suunniteltiin sukellusveneen kansitykiksi