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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Martston, R. M. (1998-07-15). Security Electronics Circuits Manual. Newnes. ISBN 978-0-08-093854-7. <a href="978-0-08-093854-7" target="_blank">978-0-08-093854-7</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Safety), Center for Chemical Process (2017-01-06). Guidelines for Safe Automation of Chemical Processes. John Wiley & Sons. ISBN 978-1-119-35189-4. <a href="978-1-119-35189-4" target="_blank">978-1-119-35189-4</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Schum, John L. (1988). Electronic Locking Devices. Butterworths. ISBN 978-0-409-90125-2. <a href="978-0-409-90125-2" target="_blank">978-0-409-90125-2</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Key switches". Maplin Electronics. Retrieved 23 August 2014. <a href="http://www.maplin.co.uk/c/components/switches/key-switches" target="_blank">http://www.maplin.co.uk/c/components/switches/key-switches</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Simulation of a Peacekeeper missile launch". Defence Imagery. Retrieved 23 August 2014. <a href="http://dodimagery.afis.osd.mil/imagery.html#a=search&s=simulation%20of%20a%20Peacekeeper%20Missile%20Launch&t=0&guid=0f307fd0b6d2c847b0c0e2dcbaac7a20a6f6a092" target="_blank">http://dodimagery.afis.osd.mil/imagery.html#a=search&s=simulation%20of%20a%20Peacekeeper%20Missile%20Launch&t=0&guid=0f307fd0b6d2c847b0c0e2dcbaac7a20a6f6a092</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Low-Cost Security Measures for School Facilities" (PDF). National Clearinghouse for Educational Facilities. Retrieved 1 September 2014. <a href="http://www.ncef.org/pubs/low_cost_measures.pdf" target="_blank">http://www.ncef.org/pubs/low_cost_measures.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"Product Bulletin for 30 Amp AC Toggle Switches". Leviton. Retrieved 1 September 2014. <a href="http://www.leviton.com/OA_HTML/ibcGetAttachment.jsp?cItemId=xreQ9kM.SwSAGa6JaqTCzw" target="_blank">http://www.leviton.com/OA_HTML/ibcGetAttachment.jsp?cItemId=xreQ9kM.SwSAGa6JaqTCzw</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> </ol>