By June 1948, witnessing currents flowing through point-contacts, Mataré produced consistent results using samples of germanium produced by Welker, similar to what Bardeen and Brattain had accomplished earlier in December 1947.
En xuño de 1948, Mataré produciu resultados consistentes e reproducibles utilizando mostras de xermanio producidas por Welker, similares ao que Bardeen e Brattain lograran anteriormente en decembro de 1947.