1851 Great Exhibition: Official Catalogue: Class X.: John Kohler
From Graces Guide
540. KOHLER, JOHN, 35 Henrietta Street, Covent Garden — Patentee and Manufacturer.
Patent three-valve instruments—lever cornetto, in Eb, cornopean, in Bb, trumpet, in Eb; trombone, in Bb; trombone, in G; patent clavicor and bombardone, each with four valves in Eb; and French horn, with two valves in Eb; patent lever trumpet in Eb with two valves; small pocket cornopean in A with two valves; cylinder cornopean in Bb with three valves; cylinder tenor horn in Bb with three valves; and Harper's improved chromatic slide trumpet in Eb.
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