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• https://upload.wikimedia.org/wikipedia/commons/2/25/Steinway_Grand_Piano_Iron_Plates_and_Strings.jpg
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• http://www.piano.christophersmit.com/rim.html
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• http://eu.steinway.com/en/a-legend/manufacturing/
• https://www.google.ie/search?q=strings+on+piano&rlz=1C1CHWA_enIE631IE631&espv=2&biw=1280&bih=899&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjX6vzAlufMAhXpJ8AKHbsnAYgQ_AUIBigB#q=strings+on+piano&tbm=isch&tbs=sur:fc&imgdii=clwObdwfUEPxbM%3A%3BclwObdwfUEPxbM%3A%3BA-dn_TkSHFNAWM%3A&imgrc=clwObdwfUEPxbM%3A