Safety relay (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Safety relay" in English language version.

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patent-de.com

"Dokument DE4033801C1 | Patent specification Emergency stop relay". patent-de.com. Retrieved 2016-11-30.

pilz.com

Safety Compendium, Chapter 4 Safe control technology, p. 115
Pilz GmbH. "Safety relays PNOZ - Pilz INT". pilz.com. Retrieved 2016-11-30.
Safety Compendium, Chapter 4.1, Safety relays p. 116
Safety compendium, Chapter 4.1, Safety relays p. 118