Signals

The bell system. This is how I communicate with the outside world.

	Postal address
	Graukaue Michael Holtkamp Fürst-Leopold-Platz 1 46284 Dorsten Germany

On iMessage and FaceTime, I can be reached under the following address.

Tweets by graukaue

Bell

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Underground with Michael Holtkamp

Under the roof of the Gray Coe there are countless microphones, with each microphone being suspended from the ceiling just like a clothes hook. At the beginning of a shift, each miner lowers his microphone, like the announcer in a boxing ring did in the past. When the bell rings three times, the crew goes down into the mine. Glückauf!

	Phone
	+49 2362 9666346

	Phone
	+49 2362 9666346

	Fax
	+49 2362 9666347

	Fax
	+49 2362 9666347