public sealed class UserAgentHeader : Header, 
	ISIPCloneable<UserAgentHeader>

Public NotInheritable Class UserAgentHeader
	Inherits Header
	Implements ISIPCloneable(Of UserAgentHeader)

public ref class UserAgentHeader sealed : public Header, 
	ISIPCloneable<UserAgentHeader^>

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