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cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1030013948_C/1030013951_T6/1030013951… · of a mouthpiece so constructed that by an arrangement of valves the products of expiration

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Page 1: cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1030013948_C/1030013951_T6/1030013951… · of a mouthpiece so constructed that by an arrangement of valves the products of expiration
Page 2: cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1030013948_C/1030013951_T6/1030013951… · of a mouthpiece so constructed that by an arrangement of valves the products of expiration
Page 3: cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1030013948_C/1030013951_T6/1030013951… · of a mouthpiece so constructed that by an arrangement of valves the products of expiration