"technology"=>"GSM 900","tower:type"=>"communication"
"technology"=>"GSM 1800;GSM 900","tower:type"=>"communication"
"design"=>"three-level","ref"=>"NOL303-35","structure"=>"lattice"
"design"=>"three-level","ref"=>"NOL303-36","structure"=>"lattice"
"design"=>"three-level","ref"=>"NOL303-37","structure"=>"lattice"
"design"=>"three-level","ref"=>"NOL303-38","structure"=>"lattice"
"design"=>"three-level","ref"=>"NOL303-39","structure"=>"lattice"