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.
But was KDKA the first station? Though its November 2, 1920 debut is considered the official start of Radio broadcasting, others were doing the same prior to KDKA. Earlier that same year, in Detroit, WWJ using call letters 8MK began regular broadcasts.