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Astronomy1

optical testing instruments1
optical testing instruments; pinhole testers; personal property1
personal property1
pinhole testers1

Dall, Horace Edward, 1901-19861
Horace Edward Dall1

Place of origin

Luton1
Luton, Bedfordshire, United Kingdom1

From year To year

Two optical pinholes, plus test lamps, overhang adjustment, box of turrets

Two optical pinholes

1950-1975

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