'In 1819, R. Laennec invented this doctor's instrument, but didn't say to warm it before use'
stethoscope
19th CENTURY: In 1819, R. Laennec invented this doctors instrument, but didnt say to warm it before use
In 1819, R. Laennec invented this doctor's instrument, but didn't say to warm it before use
In 1819, R. Laennec invented this doctor's instrument, but didn't say to warm it before use
19th CENTURY
stethoscope
19th CENTURY