Only in the 14th century did people have the knowledge to build similar devices.

What if someone on this world has built a device?

But it's getting difficult to build other devices you need these days.

He immediately set out to build such a device for himself.

Rudy knows that you and I have the knowledge to build such a device.

There is some evidence for this device being independently built at several different times.

It has a number of interesting devices built into its fingertips.

You wish to know if we can build such devices.

All I mean is this- it will be easy to build a device to see through the cloak.

It hopes manufacturers will use them to build new devices of their own.