25/02/1930 Improvements introduced in the insurance mechanisms applicable to revolvers
Patent of invention Nº 116.961
https://armia-eibar.eus/en/research/digital-archive/olave-solozabal-y-cia---el-casco/arms/patentes-originales-de-el-casco/patente-no116.961
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25/02/1930 Improvements introduced in the insurance mechanisms applicable to revolvers
Patent of invention Nº 116.961
