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Grace's spectroscope
Browning, John
Late 19th c.
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Hartridge Reversion Spectroscope
W.H. Grayling
1920s?
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Hartridge Spectroscope
R. & J. Beck Ltd
c.1937?
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Jeweller's Spectacle-Mounted Direct Vision Spectroscope
Browning, John
1900-1910
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Rain-band spectroscope & case
Browning, John
Late 19th c.
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Thorp's Spectroscope & case
R. & J. Beck Ltd
Late 19th c. / Early 20th c.
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