. . "periscope"^^ . "an optical instrument that provides a view of an otherwise obstructed field"@en-us . . . . "periscope"@en-us . "an optical instrument that provides a view of an otherwise obstructed field"@en-us . "103769321"@en-us . . . "0"^^ . . . . . "103108535"@en-us . "103917048"^^ . . "0"^^ . "03917048-n"^^ .