We report on interferometric observations at 1.3Â mm at 2 " -3 " resolution using the Combined Array for Research in Millimeter-wave Astronomy ( CARMA ) . We identify multi-wavelength counterparts of three submillimeter galaxies ( SMGs ; \mathrm { F _ { 1 mm } } > 5.5 Â mJy ) in the COSMOS field , initially detected with MAMBO and AzTEC bolometers at low , \sim 10 " -30 " , resolution . All three sources – AzTEC/C1 , Cosbo-3 and Cosbo-8 – are identified to coincide with positions of 20Â cm radio sources . Cosbo-3 , however , is not associated with the most likely radio counterpart , closest to the MAMBO source position , but that further away from it . This illustrates the need for intermediate-resolution ( \sim 2 " ) mm-observations to identify the correct counterparts of single-dish detected SMGs . All of our three sources become prominent only at NIR wavelengths , and their mm-to-radio flux based redshifts suggest that they lie at redshifts z \gtrsim 2 . As a proof of concept , we show that photometric redshifts can be well determined for SMGs , and we find photometric-redshifts of 5.6 \pm 1.2 , 1.9 ^ { +0.9 } _ { -0.5 } , and \sim 4 for AzTEC/C1 , Cosbo-3 , and Cosbo-8 , respectively . Using these we infer that these galaxies have radio-based star formation rates of \gtrsim 1000 Â \mathrm { M } _ { \odot } \mathrm { yr } ^ { -1 } , and IR luminosities of \sim 10 ^ { 13 } Â \mathrm { L } _ { \odot } Â consistent with properties of high-redshift SMGs . In summary , our sources reflect a variety of SMG properties in terms of redshift and clustering , consistent with the framework that SMGs are progenitors of z \sim 2 and today ’ s passive galaxies .