Heat sealer used to prepare plastic bag of lettuce for shelf life testing. A heat sealer is a machine used to seal products, packaging, and other thermoplastic materials using heat. This can be with uniform thermoplastic monolayers or with materials having several layers, at least one being thermoplastic.
KDNK (88.1 FM) is a community access station broadcasting an eclectic format of music and local news in western Colorado in the United States.
So, in one sense KDKA's First Station claim is accurateâit was the first commercial broadcasting license to be issued. But KDKA wasn't the first broadcasterânot by a long shot. Nor were the 1920 election returns the first scheduled broadcastâseveral stations had announced schedules for programming prior to KDKA, notably XWA in Montreal (later CKAC), which broadcast on a scheduled basis six months before KDKA.