diff --git a/src/IxMilia.Dxf.Generator/EntityGenerator.cs b/src/IxMilia.Dxf.Generator/EntityGenerator.cs
index 58531da8..fc9b0469 100644
--- a/src/IxMilia.Dxf.Generator/EntityGenerator.cs
+++ b/src/IxMilia.Dxf.Generator/EntityGenerator.cs
@@ -327,7 +327,7 @@ private void OutputSingleDxfEntity(XElement entity)
             AppendXData(entity);
             AppendDefaultConstructor(entity);
             AppendParameterizedConstructors(entity);
-            AppendCopyConstructor(entity, "DxfEntity");
+            AppendCopyConstructor(entity);
             AppendInitializeMethod(entity, BaseClass(entity, "") == "DxfDimensionBase" ? $"this.DimensionType = DxfDimensionType.{Tag(entity)};" : null);
             AppendAddValuePairsMethod(entity);
             AppendTrySetPairMethod(entity);
diff --git a/src/IxMilia.Dxf.Generator/GeneratorBase.cs b/src/IxMilia.Dxf.Generator/GeneratorBase.cs
index d5cfa80f..86d6271e 100644
--- a/src/IxMilia.Dxf.Generator/GeneratorBase.cs
+++ b/src/IxMilia.Dxf.Generator/GeneratorBase.cs
@@ -69,7 +69,7 @@ public void AppendAddValuePairsMethod(XElement item)
             }
         }
 
-        public void AppendCopyConstructor(XElement item, string baseClass)
+        public void AppendCopyConstructor(XElement item)
         {
             var copyConstructorAccessibility = CopyConstructor(item);
             if (copyConstructorAccessibility != null)
@@ -87,6 +87,7 @@ public void AppendCopyConstructor(XElement item, string baseClass)
                     AppendLine("    : base(other)");
                     AppendLine("{");
                     IncreaseIndent();
+                    AppendLine("CopyManualValues(other);");
                     AppendLine("((IDxfHasXDataHidden)this).XDataHidden = ((IDxfHasXDataHidden)other).XDataHidden;");
                     foreach (var property in GetPropertiesAndPointers(item))
                     {
diff --git a/src/IxMilia.Dxf.Generator/ObjectGenerator.cs b/src/IxMilia.Dxf.Generator/ObjectGenerator.cs
index fa255d35..ce24407e 100644
--- a/src/IxMilia.Dxf.Generator/ObjectGenerator.cs
+++ b/src/IxMilia.Dxf.Generator/ObjectGenerator.cs
@@ -278,7 +278,7 @@ private void OutputSingleDxfObject(XElement obj)
             AppendXData(obj);
             AppendDefaultConstructor(obj);
             AppendParameterizedConstructors(obj);
-            AppendCopyConstructor(obj, "DxfObject");
+            AppendCopyConstructor(obj);
             AppendInitializeMethod(obj);
             AppendAddValuePairsMethod(obj);
 
diff --git a/src/IxMilia.Dxf.Generator/Specs/EntitiesSpec.xml b/src/IxMilia.Dxf.Generator/Specs/EntitiesSpec.xml
index 63e4b402..2a6ca57c 100644
--- a/src/IxMilia.Dxf.Generator/Specs/EntitiesSpec.xml
+++ b/src/IxMilia.Dxf.Generator/Specs/EntitiesSpec.xml
@@ -471,6 +471,23 @@
             <Value>DefinitionPoint3</Value>
         </Extents>
     </Entity>
+    <!-- angular, 2 line -->
+    <Entity Name="DxfAngularTwoLineDimension" EntityType="Dimension" SubclassMarker="AcDb2LineAngularDimension" TypeString="" BaseClass="DxfDimensionBase" CopyConstructor="Inherited" HasXData="true" Tag="Angular">
+        <Property Name="FirstExtensionLineP1" Code="13" Type="DxfPoint" DefaultValue="DxfPoint.Origin" CodeOverrides="13,23,33" />
+        <Property Name="FirstExtensionLineP2" Code="14" Type="DxfPoint" DefaultValue="DxfPoint.Origin" CodeOverrides="14,24,34" />
+        <Property Name="SecondExtensionLineP2" Code="15" Type="DxfPoint" DefaultValue="DxfPoint.Origin" CodeOverrides="15,25,35" />
+        <Property Name="DimensionLineArcLocation" Code="16" Type="DxfPoint" DefaultValue="DxfPoint.Origin" CodeOverrides="16,26,36" />
+        <Extents>
+            <!-- from DxfDimensionBase -->
+            <Value>TextMidPoint</Value>
+            <!-- from this entity -->
+            <Value>FirstExtensionLineP1</Value>
+            <Value>FirstExtensionLineP2</Value>
+            <Value>SecondExtensionLineP1</Value>
+            <Value>SecondExtensionLineP2</Value>
+            <Value>DimensionLineArcLocation</Value>
+        </Extents>
+    </Entity>
     <!--
 
     ELLIPSE
diff --git a/src/IxMilia.Dxf.Test/DxfEntityTests.cs b/src/IxMilia.Dxf.Test/DxfEntityTests.cs
index b7cc8388..3035cdfc 100644
--- a/src/IxMilia.Dxf.Test/DxfEntityTests.cs
+++ b/src/IxMilia.Dxf.Test/DxfEntityTests.cs
@@ -1346,6 +1346,62 @@ public void WriteDimensionTest()
 ");
         }
 
+        [Fact]
+        public void ReadAngularTwoLineDimensionTest()
+        {
+            var dim = (DxfAngularTwoLineDimension)Entity("DIMENSION", @"
+100
+AcDbDimension
+ 10
+1.0
+ 20
+2.0
+ 30
+3.0
+ 11
+4.0
+ 21
+5.0
+ 31
+6.0
+ 70
+    130
+100
+AcDb2LineAngularDimension
+ 13
+7.0
+ 23
+8.0
+ 33
+9.0
+ 14
+10.0
+ 24
+11.0
+ 34
+12.0
+ 15
+13.0
+ 25
+14.0
+ 35
+15.0
+ 16
+16.0
+ 26
+17.0
+ 36
+18.0
+");
+            Assert.True(dim.IsAtUserDefinedLocation);
+            Assert.Equal(new DxfPoint(1.0, 2.0, 3.0), dim.SecondExtensionLineP1);
+            Assert.Equal(new DxfPoint(4.0, 5.0, 6.0), dim.TextMidPoint);
+            Assert.Equal(new DxfPoint(7.0, 8.0, 9.0), dim.FirstExtensionLineP1);
+            Assert.Equal(new DxfPoint(10.0, 11.0, 12.0), dim.FirstExtensionLineP2);
+            Assert.Equal(new DxfPoint(13.0, 14.0, 15.0), dim.SecondExtensionLineP2);
+            Assert.Equal(new DxfPoint(16.0, 17.0, 18.0), dim.DimensionLineArcLocation);
+        }
+
         [Fact]
         public void WriteDimensionWithTrailingXDataTest()
         {
diff --git a/src/IxMilia.Dxf/Entities/DxfAngularTwoLineDimension.cs b/src/IxMilia.Dxf/Entities/DxfAngularTwoLineDimension.cs
new file mode 100644
index 00000000..38fee6b9
--- /dev/null
+++ b/src/IxMilia.Dxf/Entities/DxfAngularTwoLineDimension.cs
@@ -0,0 +1,13 @@
+// Copyright (c) IxMilia.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+namespace IxMilia.Dxf.Entities
+{
+    public partial class DxfAngularTwoLineDimension
+    {
+        public DxfPoint SecondExtensionLineP1
+        {
+            get => DefinitionPoint1;
+            set => DefinitionPoint1 = value;
+        }
+    }
+}
diff --git a/src/IxMilia.Dxf/Entities/DxfDimensionBase.cs b/src/IxMilia.Dxf/Entities/DxfDimensionBase.cs
index 9f228678..cc313b46 100644
--- a/src/IxMilia.Dxf/Entities/DxfDimensionBase.cs
+++ b/src/IxMilia.Dxf/Entities/DxfDimensionBase.cs
@@ -10,6 +10,16 @@ public partial class DxfDimensionBase : DxfEntity
 
         public bool IsAtUserDefinedLocation { get; set; } = false;
 
+        protected override void CopyManualValues(DxfEntity other)
+        {
+            if (other is DxfDimensionBase otherDim)
+            {
+                IsBlockReferenceReferencedByThisBlockOnly = otherDim.IsBlockReferenceReferencedByThisBlockOnly;
+                IsOrdinateXType = otherDim.IsOrdinateXType;
+                IsAtUserDefinedLocation = otherDim.IsAtUserDefinedLocation;
+            }
+        }
+
         private DxfDimensionType HandleDimensionType(short value)
         {
             // reader
diff --git a/src/IxMilia.Dxf/Entities/DxfEntity.cs b/src/IxMilia.Dxf/Entities/DxfEntity.cs
index d8790e88..edd37ca6 100644
--- a/src/IxMilia.Dxf/Entities/DxfEntity.cs
+++ b/src/IxMilia.Dxf/Entities/DxfEntity.cs
@@ -228,6 +228,10 @@ internal virtual void AddObjectsToOutput(List<DxfObject> objects)
         {
         }
 
+        protected virtual void CopyManualValues(DxfEntity other)
+        {
+        }
+
         protected virtual DxfEntity PostParse()
         {
             return this;