Hello Steemit! This is 
So, our first thing is Laptop.
"Laptop":-
(image source: https://www.google.com/search?q=laptop&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiTt6_ZsZ7ZAhXJKMAKHUgbB0wQ_AUICigB&biw=1366&bih=662#imgrc=MSqWlsZXcx0T9M:)
" Adam Osborne"
The laptop is a great invention in the history of inventions. The name of laptop inventor is Adam Osborne. He invented the laptop in 1981. Its name was ''Osborne 1'' and its cost was $1,795. It came bundled with $1,500 worth of programmes. It had a tiny computer screen built into it.
The second thing is Mobile which approximately every one use.
"Mobile":-
(image source: https://www.google.com/search?tbm=isch&q=Mobile&chips=q:mobile,g_3:apple&sa=X&ved=0ahUKEwjjrpCotZ7ZAhUJKcAKHeekA_cQ4lYILigD&biw=1366&bih=613&dpr=1#imgrc=VpetSwLvp_JfwM:)
"Martin Cooper"
Martin Cooper invented handheld cellular mobile phone making world's first handheld cellular mobile phone call. Martin Cooper born on December 26, 1928. He is an American engineer. He is a pioneer and visionary in the wireless communications industry.
"USB(Universal Serial Bus)":-
Ajay Bhatt
Ajay V. Bhatt is an Indian-American computer architect. He developed the first USB. The first USB technology began development in 1994, co-invented by Ajay Bhatt of Intel and the USB-IF (USB Implementers Forum, Inc). The organization is comprised of industry leaders just like Intel, Microsoft, Compaq, LSI, & Apple.
"Head Phone":-
(image source:https://www.google.com/search?biw=1366&bih=613&tbm=isch&sa=1&ei=eoSAWsvCBOaWgAbes7XwCw&q=Headphone+&oq=Headphone+&gs_l=psy-ab.3..0i10k1j0l2j0i10k1l3j0j0i10k1l2j0.423539.428030.0.429587.16.10.1.0.0.0.951.2408.6-3.3.0....0...1c.1.64.psy-ab..12.4.2459....0.vWEjCW1i3iA#imgrc=BhscNwTMxb7aXM:)
In the Navy Fundamentalist engineer Nathaniel Baldwin and Mormon invented the first pair of audio headphones on his kitchen table in 1910.
So guys! I hope you'll like my post... Good bye till the next post..