000 003140000a22001330004500
008 140223b1946 xxu||||| |||| 00| 0 eng d
041 _aENG
080 _aC6:45 H6
082 _aC6:45 H6
100 _aSOMMER (A)
245 _aPhotoelectric cells.
260 _alondon
_bMethuen
_c1946
650 _aELECTRICITY
999 _c226594
_d226594