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diff --git a/ETL/tags/ETL_0_04_10/ETL/_mutex_null.h b/ETL/tags/ETL_0_04_10/ETL/_mutex_null.h
deleted file mode 100644
index 6c0d21e..0000000
--- a/ETL/tags/ETL_0_04_10/ETL/_mutex_null.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/*! ========================================================================
-** Extended Template and Library
-** NULL Mutex Abstraction Class Implementation
-** $Id$
-**
-** Copyright (c) 2002 Robert B. Quattlebaum Jr.
-**
-** This package is free software; you can redistribute it and/or
-** modify it under the terms of the GNU General Public License as
-** published by the Free Software Foundation; either version 2 of
-** the License, or (at your option) any later version.
-**
-** This package is distributed in the hope that it will be useful,
-** but WITHOUT ANY WARRANTY; without even the implied warranty of
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-** General Public License for more details.
-**
-** === N O T E S ===========================================================
-**
-** This is an internal header file, included by other ETL headers.
-** You should not attempt to use it directly.
-**
-** ========================================================================= */
-
-/* === S T A R T =========================================================== */
-
-#ifndef __ETL__MUTEX_NULL_H_
-#define __ETL__MUTEX_NULL_H_
-
-/* === H E A D E R S ======================================================= */
-/* === M A C R O S ========================================================= */
-
-/* === C L A S S E S & S T R U C T S ======================================= */
-
-_ETL_BEGIN_NAMESPACE
-
-class mutex_null
-{
-public:
-
-	mutex_null(){}
-	~mutex_null(){}
-	//! Exception-safe mutex lock class
-/*
-	class lock
-	{
-		mutex *_mtx;
-	public:
-		lock(mutex &x):_mtx(&x) { _mtx->lock_mutex(); }
-		~lock() { _mtx->unlock_mutex(); }
-		mutex &get() { return *_mtx; }
-	};
-*/
-	class lock
-	{
-	public:
-		lock(mutex_null &/*x*/) { }
-	};
-
-	void lock_mutex(){}
-	bool try_lock_mutex(){return true;}
-	void unlock_mutex(){}
-};
-
-_ETL_END_NAMESPACE
-
-/* === E X T E R N S ======================================================= */
-
-/* === E N D =============================================================== */
-
-#endif