Initial javelins were made of wood until the mid-1950's. Dick Held improved javelin aerodynamics and durability by introducing aluminum javelins around that time (his brother, Bud, was the world-record holder for a time). Current javelins are made of steel, aluminum and/or carbon fiber.
wood and iron
iron
wood and iron
none, automobiles are the innovations not the innovator.
automobiles
there was 134,000 automobiles made is 1950
traction.
Mobile sound systems are not only made for automobiles. Mobile sound systems are made for a variety of others such as motorcycles and bicycles and for outdoor events,.
Science has been used to create airbags, and seatbelts to make automobiles safer. =)
he took ideas from people and worked with them on the automobiles and made them more efficient
No. They are the same.