00349nam a2200157Ia 4500 Congress Electrical Engineering RB Opto-Elektronik Opto-Elektronik International Congress Germany 1981 621.3 ICITF 268 ENGLISH 29351 29351 0 0 0 0 AFT CRCE CRCE 1566 | 3 2023-03-17 0 621.3 ICITF AFT4602 2023-03-17 2023-03-17 RB