Radiation Laboratory, Massachusetts Institute of Technology; Reports. M-217. Instructions for types TXF-17GA, TFX-19GA, TFX-30EC, TFX-31EC, model 51 and similar types of micrometer frequency meters. Supplement to Report M-217 on frequency meters TFX-40GA, TFX-41Ga, and TFX-43EC. n.d.

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