Question

please tell me the answer​

Answer 1

1)Pre-electric

AD 26–37 – Roman Emperor Tiberius rules the empire from the island of Capri by signaling messages with metal mirrors to

reflect the sun.

2)Telegraph

1792 – Claude Chappe establishes the first long-distance semaphore telegraph line.

3)Landline telephone

1876 – Alexander Graham Bell and Thomas A. Watson exhibit an electric telephone in Boston.

1889 – Almon Strowger patents the direct dial telephone.

4)Phonograph

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1877 – Thomas Edison patents the phonograph.

5)Radio and television

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1920 – Radio station KDKA based in Pittsburgh began the first broadcast.

1925 – John Logie Baird transmits the first television signal.

1942 – Hedy Lamarr and George Antheil invent frequency hopping spread spectrum communication technique.

1947 – Full-scale commercial television is first broadcast.

1963 – First geosynchronous communications satellite is launched, 17.5 years after Arthur C. Clarke's article.

1999 – Sirius satellite radio is introduced.

6)Fax

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1843 – Patent issued for the "Electric Printing Telegraph", a very early forerunner of the fax machine

1926 – Commercial availability of the radiofax

1964 – First modern fax machine commercially available (Long Distance Xerography)

Mobile telephone

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1947 – Douglas H. Ring and W. Rae Young of Bell Labs propose a cell-based approach which led to "cellular phones."

1981 – Nordic Mobile Telephone, the world's first automatic mobile phone is put into operation

1991 – GSM is put into operation

1992 – Neil Papworth sends the first SMS (or text message).

1999 – 45% of Australians have a mobile phone.

7)Computers and Internet

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1949 – Claude Elwood Shannon, the "father of information theory", mathematically proves the Nyquist–Shannon sampling theorem.

Answer 2

MAY BE ABOVE ANSWER IS CORRECT

I AM NOT SURE