public sealed class Contact : Header, 
	IValidation, ISIPCloneable<Contact>

Public NotInheritable Class Contact
	Inherits Header
	Implements IValidation, ISIPCloneable(Of Contact)

public ref class Contact sealed : public Header, 
	IValidation, ISIPCloneable<Contact^>

[<SealedAttribute>]
type Contact =  
    class
        inherit Header
        interface IValidation
        interface ISIPCloneable<Contact>
    end