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/ 5
lead rods

lead rods

American
1900-1950
metal sample: aluminum bar

metal sample: aluminum bar

Theodore William Richards
circa 1900
metal sample: aluminum bar

metal sample: aluminum bar

circa 1900
metal sample: copper rod

metal sample: copper rod

Theodore William Richards
circa 1900
metal sample: lead rod

metal sample: lead rod

Theodore William Richards
1925
metal sample (rod)

metal sample (rod)

Theodore William Richards
circa 1900
metal sample (rod)

metal sample (rod)

American
circa 1925
metal sample (rod)

metal sample (rod)

Theodore William Richards
circa 1925
metal sample: steel rod

metal sample: steel rod

Theodore William Richards
early 20th Century
nickel screen plate section for paper machine

nickel screen plate section for paper machine

Chromium Corporation of America
date 1961
platium wire sample in a stoppered glass test tube

platium wire sample in a stoppered glass test tube

Percy Williams Bridgman
circa 1925
sealed glass tube of barium shavings

sealed glass tube of barium shavings

Theodore William Richards
circa 1900
/ 5

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