17김리호_통신수단(전화)발달조사하기 by 김리호 https://padlet.com/21g3217/88w7az7dhqlqp0pv en-us 2021-06-17 02:09:09 UTC 2025-10-29 13:55:08 UTC hello@padlet.com 교환원이 있는 전화 21g3217 https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611281863 2021-06-17 02:18:39 UTC https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611281863 교환원이 있는 전화는 교환업무 개시함 21g3217 https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611297633 2021-06-17 02:26:20 UTC https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611297633 21g3217 https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611316244 유선 전화]]> 2021-06-17 02:36:06 UTC https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611316244 스마트폰 시대에 유선 전화를 쓰는 과정을 보기어려워졋다 21g3217 https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611325114 2021-06-17 02:40:57 UTC https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611325114 무선 전화 21g3217 https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611346826 2021-06-17 02:51:55 UTC https://padlet.com/21g3217/88w7az7dhqlqp0pv/wish/1611346826