http://vas8.blogspot.com/2012/12/vishvakarman-blog-youtube.html
Confirmed By Krishna to Arjuna in Mahabahratha
When he says the inability of Trishula(Trident) of Shiva and Sudarshan(Chakra) of Vishnu Made From Same Material to cut Armour and Ear rings Made of Same Material of Karna
http://k00y.blogspot.com/2014/02/three-worlds.html
Confirmed By Krishna to Arjuna in Mahabahratha
When he says the inability of Trishula(Trident) of Shiva and Sudarshan(Chakra) of Vishnu Made From Same Material to cut Armour and Ear rings Made of Same Material of Karna
http://k00y.blogspot.com/2014/02/three-worlds.html
Together