최소 단어 이상 선택하여야 합니다.
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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
|
출원번호 | US-0659649 (1976-02-20) |
우선권정보 | JA-0023205 (1975-02-25) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 20 인용 특허 : 1 |
An intercommunication system in a group teaching or training system in which a teacher station and a plurality of student stations are interconnected with a common outgoing line and a common incoming line, and each station includes a transmitter and a receiver, and wherein the teacher station includ
In an intercommunication system in which a teacher station and a plurality of student stations are interconnected with a common outgoing line and a common incoming line, the improvement wherein said teacher and student stations comprise: a transmitter and a receiver, the transmitter and receiver in
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