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