000			00311nam a2200121Ia 4500
005			20251007104354.0
008			251006s9999 xx 000 0 und d
100			_asmith,p.s.
245		0	_a.50 photoclectric circuits and systems. smith,p.s.
260			_a1st.ed | .London Iliffe
260			_c1972
942			_cBOK
999			_c5829 _d5829