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Chappell Datumset
Pell Optical Co
20th c.
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Chappell Datumset
Pell Optical Co
c.1967
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Chappell Datumset
Pell Optical Co
c.1967
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Chappell Datumset
Pell Optical Co
20th c.
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Chappell Datumset
Pell Optical Co
20th c.
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Datum Line Guide
R. Archer & Sons Ltd
c.1930
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Datum Rule
Willesden Optical Works Ltd
20th c.
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Empire Contourmeter and Datum frame rule & case
M. Wiseman & Company Ltd
Mid 20th c.
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Empire Datum (Frame) Rule
Mid 20th c.
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Empire Datum Frame Rule
M. Wiseman & Company Ltd
20th c.
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Empire Datum Frame Rule with parallelogram
M. Wiseman & Company Ltd
20th c.
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Empire Datum Frame Rule with parallelogram
M. Wiseman & Company Ltd
Mid 20th c.
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Empire Datum Frame Rule with parallelogram
M. Wiseman & Company Ltd
20th c.
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Empire Datum Frame Rule with parallelogram
M. Wiseman & Company Ltd
20th c.
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The 'Optrex' Rule
John Baird & Sons
Early-Mid 20th c.
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The New Optrex Datum Rule
John Baird & Sons
Post 1929
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The New Optrex Datum Rule
John Baird & Sons
Post 1929
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The New Optrex Datum Rule
John Baird & Sons
20th c.
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Wiseco Datum Peg Set
M. Wiseman & Company Ltd
20th c.
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WOW Datum Rule
Willesden Optical Works Ltd
Mid 20th c.
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