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This instrument allows the surgeon perfect vision through his own glasses. The device is simple, inexpensive, indestructible and transferable from mirror to mirror as occasion demands.
LUKENS C. EXTENSION HEAD MIRROR LINK FOR SURGEON WEARING BIFOCAL LENSES. Arch Otolaryngol. 1934;19(5):620. doi:10.1001/archotol.1934.03790050085015
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