![](http://www.alamy.com/thumbs/6/144680C0-C00D-4ABC-AD20-74BEB0E3FF0A/DT63T7.jpg)
sign at blackboard
Size: 3785px × 2599px
Photo credit: © aialamy / Alamy / Afripics
License: Licensed
Model Released: None
Keywords: 4g, blackboard, board, cellular, chalk, chalkboard, communication, computer, connection, download, global, graphic, gsm, high, html, icon, industry, internet, issue, line, link, load, lte, mail, microwave, mobile, mobility, net, network, note, phone, search, sign, speed, superiority, symbol, technology, telephone, text, victory, wave, web, website, wide, wireless, world, www