We present results on 761 photon conversions into external pairs and 166 neutral strange particles decays at 69 GeV/c. The cross sections of the inclusive reactionspp ⇒ &ggr;X, K°X, &Lgr;X, are respectively 162.2±8.0. 8.4±1.1 and 3.6±0.5 mb. The average number of &pgr;° per inelastic pp collisions is found to be 2.5T±0.13; this number increases with the number n of charged particles up to at leastn = 10. Data are presented in terms of the invariant cross sectionsF(x,p⊥,s)scaling is approximately valid for &ggr;, K° and &lgr; production while our data on photons are incompatible with a simple factorization of the invariant cross sectionF(x,p⊥,s) = f(x)×g(p⊥).