switchboard শব্দের উদাহরণ বাক্য (Example Sentences)
Sailors in HMS Argyll have been praised for their quick response when a fire was discovered in the frigate's forward electrical switchboard .
By 1887 there were 26,000 telephones in use in Britain (and 150,000 in the United States) and multiple switchboards had been installed in most major towns and cities.