Oehler System
No. 7
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Silver plated mechanism, five rings, forked Bb
mechanism, thumbkey connection (high B-C sharp trill),
double C trill key, four trill keys, adjustable B-C sharp
trill, Eb lever, F lever, four rollers, forked F mechanism
on middle joint, mechanism for high E, covered forked F
hole, two barrels, one mouthpiece
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