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This week there are a number of items of interest for those involved in public-safety communications. A rugged handheld device company has given up on ProSe while a Push-To-Talk (PTT) company is launching its second-generation products. And a U.S. Department of Home Security (DHS) report that outlines products designed to equip first responders with tools to make their jobs easier includes a navigation and directions product that is designed to make it easier for first responders to reach the scene of an incident…