[1] https://cache.industry.siemens.com/dl/files/188/1137188/att_27471/v1/SCLV4_e.pdf
[2] http://w3.usa.siemens.com/us/internet-dms/ia/automationcomm/automation/docs/graph7_e.pdf
[3] http://www.coffee-machine.org/coffee-machine-and-espresso-machine-history/
[4] http://au.rs-online.com/web/p/touch-screen-hmi-displays/0563958/