Macewen's Brace Trephine in case The rectangular wooden case unlocks by sliding the only brass hook left. Upon opening the hinged lid, compartments store the handle with cranks and cross handle. One end features a screw-in mechanism to secure the three trephine heads (crown). It is engraved with a patent number. The bottom of the case is engraved with "W. TAYLOR 1914". 1900-1949