_:vb50822496 . _:vb50822497 . _:vb50822497 . . _:vb50822496 . "2019-03-05" . _:vb50822496 "Anssi Kostiainen" . _:vb50822498 . _:vb50822498 . . . _:vb50822497 "Rijubrata Bhaumik" . . . _:vb50822498 . . "Proximity Sensor" .