Storing very important information on the hardest and most durable material(s)

Most durable and most hardest material(s). And maybe also the most heat resistant material. For etching information on it.

For storing some very important information in a primitive way.
And the information needs to be put on it with special machines.

By GOTT/GOD, Jeffried Koelewijn.
From South-Holland, The Netherlands.

Induction heating device which you can open and close

Induction heating device which you can open and close.
So being able to open and close it around a metal.

Extra: Maybe using the most heat resistant ceramic or most heat resistant metal around the coils.

By Jef Koelewijn
From, The Netherlands

Update: Very useful for smithing.

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Update: Maybe it can also be used to destroy.

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Update: A portable version. With an external, changeable power supply.