The Blackhawks signed four prospects to entry-level contracts, including left wing Rob Klinkhammer, defensemen Jonathan Carlsson and Brian Connelly and goaltender Alec Richards. Carlsson, 20, has spent each of the last three seasons in the Swedish Elite League, which includes posting one assist and 58 penalty minutes in 55 games with Brynas IF Gavle. The Uppsala, Sweden, native was the Blackhawks? fourth choice, 162nd overall, in the 2008 National Hockey League Entry Draft.