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1. december 2017 – 11. januar 2021

Cover for Tech Tron · Elias Howe and His Sewing Machine U.S. Economy in the mid-1800s Grade 5 Children's Computers & Technology Books (Paperback Bog) (2021)

Elias Howe and His Sewing Machin... (2021)

Cover for Tech Tron · How Are Lasers Used Today? Light and Optics for Grade 5 Children's Physics Books (Paperback Bog) (2021)

How Are Lasers Used Today? Light... (2021)

Cover for Tech Tron · Inventions That Shaped America US Industrial Revolution Books Grade 6 Children's Inventors Books (Paperback Bog) (2021)

Inventions That Shaped America U... (2021)

Cover for Tech Tron · Samuel Morse Invented the Telegraph - U.S. Economy in the mid-1800s Grade 5 - Children's Computers & Technology Books (Paperback Bog) (2020)

Samuel Morse Invented the Telegr... (2020)

Cover for Tech Tron · Who Discovered Electricity? Beginning Electronics Grade 5 Children's Inventors Books (Paperback Bog) (2020)

Who Discovered Electricity? Begi... (2020)

Cover for Tech Tron · How Things Work (Paperback Bog) (2019)

How Things Work (2019)

Cover for Tech Tron · Most Important Inventions Of All Time Inventions for Kids Children's Inventors Books (Paperback Bog) (2017)

Most Important Inventions Of All... (2017)

Cover for Tech Tron · The Most Famous Inventors Who Ever Lived - Inventor's Guide for Kids - Children's Inventors Books (Paperback Bog) (2017)

The Most Famous Inventors Who Ev... (2017)