DP - MPI Library TY - JOUR AU - Lewer, S. K. T1 - Course-indicator and Receiving Apparatus for Aircraft Radio-beacon UR - https://www.jstor.org/stable/43428814 T2 - Science progress : over 100 years of reporting science SP - Vol. 23, No. 92 (1929), p. 668-671 CY - London : Science Reviews 2000 Ltd PY - 1929 ER -