First results of the COSY-11 collaboration are presented in this paper. The motivation for the investigation of meson production is discussed. The description of the COSY-11 experimental apparatus, including the method of particle identification and luminosity monitoring will be shown. Preliminary results of first test measurements for the production of (pi+pi-), eta, eta', and (K+K-) mesons in the p+p interaction will be given. Furthermore, the results of a test for the pp->pK+Lambda reaction is presented.
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