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An optical device, such as a pair of field glasses or opera glasses, designed for simultaneous use by both eyes and consisting of two small telescopes joined with a single focusing device.

Double Telescope Binocular

An optical device, such as a pair of field glasses or opera glasses, designed for simultaneous use by…

Field glasses or binoculars from Ecker in Lucerne, Switzerland.

Swiss Binoculars

Field glasses or binoculars from Ecker in Lucerne, Switzerland.