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diff --git a/src/VBox/Main/include/AdditionsFacilityImpl.h b/src/VBox/Main/include/AdditionsFacilityImpl.h
new file mode 100644
index 00000000..e8a58a4e
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+++ b/src/VBox/Main/include/AdditionsFacilityImpl.h
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+/* $Id: AdditionsFacilityImpl.h $ */
+/** @file
+ * VirtualBox COM class implementation
+ */
+
+/*
+ * Copyright (C) 2014-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+#ifndef MAIN_INCLUDED_AdditionsFacilityImpl_h
+#define MAIN_INCLUDED_AdditionsFacilityImpl_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <vector>
+#include <iprt/time.h>
+
+#include "AdditionsFacilityWrap.h"
+
+class Guest;
+
+class ATL_NO_VTABLE AdditionsFacility :
+    public AdditionsFacilityWrap
+{
+public:
+
+    DECLARE_EMPTY_CTOR_DTOR(AdditionsFacility)
+
+    // public initializer/uninitializer for internal purposes only
+    HRESULT init(Guest *a_pParent, AdditionsFacilityType_T a_enmFacility, AdditionsFacilityStatus_T a_enmStatus,
+                 uint32_t a_fFlags, PCRTTIMESPEC a_pTimeSpecTS);
+    void uninit();
+
+    HRESULT FinalConstruct();
+    void FinalRelease();
+
+
+public:
+    /** Facility <-> string mappings. */
+    struct FacilityInfo
+    {
+        /** The facilitie's name. */
+        const char              *mName; /* utf-8 */
+        /** The facilitie's type. */
+        AdditionsFacilityType_T  mType;
+        /** The facilitie's class. */
+        AdditionsFacilityClass_T mClass;
+    };
+    static const FacilityInfo s_aFacilityInfo[8];
+
+    // public internal methods
+    static const AdditionsFacility::FacilityInfo &i_typeToInfo(AdditionsFacilityType_T aType);
+    AdditionsFacilityClass_T i_getClass() const;
+    LONG64 i_getLastUpdated() const;
+    com::Utf8Str i_getName() const;
+    AdditionsFacilityStatus_T i_getStatus() const;
+    AdditionsFacilityType_T i_getType() const;
+    void i_update(AdditionsFacilityStatus_T a_enmStatus, uint32_t a_fFlags, PCRTTIMESPEC a_pTimeSpecTS);
+
+private:
+
+    // Wrapped IAdditionsFacility properties
+    HRESULT getClassType(AdditionsFacilityClass_T *aClassType);
+    HRESULT getLastUpdated(LONG64 *aLastUpdated);
+    HRESULT getName(com::Utf8Str &aName);
+    HRESULT getStatus(AdditionsFacilityStatus_T *aStatus);
+    HRESULT getType(AdditionsFacilityType_T *aType);
+
+    /** A structure for keeping a facility status
+     *  set at a certain time. Good for book-keeping. */
+    struct FacilityState
+    {
+        RTTIMESPEC                mTimestamp;
+        /** The facilitie's current status. */
+        AdditionsFacilityStatus_T mStatus;
+    };
+
+    struct Data
+    {
+        /** Record of current and previous facility
+         *  states, limited to the 10 last states set.
+         *  Note: This intentionally only is kept in
+         *        Main so far! */
+        std::vector<FacilityState> mStates;
+        /** The facilitie's ID/type. */
+        AdditionsFacilityType_T    mType;
+    } mData;
+};
+
+#endif /* !MAIN_INCLUDED_AdditionsFacilityImpl_h */
+