| |||
| 按钮控制站 | |||
| 按钮站 | |||
| 按钮台; 控钮站 | |||
| 按键式电话可用按键向电话局发送双音多频数字信令 | |||
| |||
| 按钮板; 按钮台; 按钮位置 | |||
|
push-button station : 4 phrases in 3 subjects |
| Chemistry | 1 |
| Electronics | 2 |
| Oil / petroleum | 1 |
| |||
| 按钮控制站 | |||
| 按钮站 | |||
| 按钮台; 控钮站 | |||
| 按键式电话可用按键向电话局发送双音多频数字信令 | |||
| |||
| 按钮板; 按钮台; 按钮位置 | |||
|
push-button station : 4 phrases in 3 subjects |
| Chemistry | 1 |
| Electronics | 2 |
| Oil / petroleum | 1 |