Retrograde Minutes, Retrograde Date, Bi-Hemisphere Moon Phase and Automatic Winding. Functions: Left dial: Retrograde Date and Bi-Hemisphere Moon Phase Right
both Bi-2212 and Bi-2223; there is no Ca layer in the Bi-2201 phase. The three phases differ with each other in the number of CuO2 planes; Bi-2201, Bi-2212
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