Depends on the time period. Early man learned how to make tools and fish hooks. I would call the gadgets.
It depends what you mean by GADGET. If you mean helpful device - then properly the wheel
An electric motor in 1915.
According to the official definition of 'gadget', the iPod Touch is a gadget.
an electronic gadget is a gadget that has an input transducer a processor and an out put transducer
The phrase "Go go gadget" is famously associated with the animated character Inspector Gadget, a bumbling detective with various gadgets built into his body. The character was created for a television series that first aired in the 1980s. Inspector Gadget uses this catchphrase to activate his gadgets, which assist him in solving crimes and thwarting villains.
No. An airplane is a machine, not a gadget.
That depends on the specific gadget.
zoopraxiscope
it was first discovered 1888
there isn't one
Inspector Gadget - 1983 Magic Gadget - 2.1 was released on: USA: 14 October 1985
When golfing, a tee is a vital gadget. I find an apple corer to be a vital gadget in the kitchen.