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The microwave spectra of six isotopic species of dimethyl-phosphineborane, $(CH3)2HP11BH3$, $(CH3)2H10BH3$, $(CH3)2DP11BH3$, $(CH3)2DP10BH3$, $(CH3)2HP11BD2H$ and $(CH3)2HP11BD3$ have been recorded and an $ro$ structure obtained.