diff --git a/examples/speech/container.py b/examples/speech/container.py
index 686b0763..e1edbccb 100644
--- a/examples/speech/container.py
+++ b/examples/speech/container.py
@@ -6,16 +6,21 @@ import dependency_injector.containers as containers
 import dependency_injector.providers as providers
 
 
+Engine = collections.namedtuple('Engine', [])
+Car = collections.namedtuple('Car', ['serial_number', 'engine'])
+
+
 class Container(containers.DeclarativeContainer):
     """IoC container."""
 
-    engine_factory = providers.Factory(collections.namedtuple('Engine', []))
-    car_factory = providers.Factory(collections.namedtuple('Car', ['engine']),
-                                    engine=engine_factory)
+    engine_factory = providers.Factory(Engine)
+
+    car_factory = providers.Factory(Car, engine=engine_factory)
+
 
 if __name__ == '__main__':
-    car1 = Container.car_factory()
-    car2 = Container.car_factory()
+    car1 = Container.car_factory(serial_number=1)
+    car2 = Container.car_factory(serial_number=2)
 
-    assert car1 is not car2
+    assert car1.serial_number == 1 and car2.serial_number == 2
     assert car1.engine is not car2.engine
diff --git a/examples/speech/factory.py b/examples/speech/factory.py
index 36915600..d8470898 100644
--- a/examples/speech/factory.py
+++ b/examples/speech/factory.py
@@ -5,6 +5,7 @@ from dependency_injector import providers
 
 object_factory = providers.Factory(object)
 
+
 if __name__ == '__main__':
     object1 = object_factory()
     object2 = object_factory()
diff --git a/examples/speech/factory_injections.py b/examples/speech/factory_injections.py
index 3394f446..e378b85c 100644
--- a/examples/speech/factory_injections.py
+++ b/examples/speech/factory_injections.py
@@ -5,13 +5,16 @@ import collections
 import dependency_injector.providers as providers
 
 
-engine_factory = providers.Factory(collections.namedtuple('Engine', []))
-car_factory = providers.Factory(collections.namedtuple('Car', ['engine']),
-                                engine=engine_factory)
+Engine = collections.namedtuple('Engine', [])
+Car = collections.namedtuple('Car', ['serial_number', 'engine'])
+
+engine_factory = providers.Factory(Engine)
+car_factory = providers.Factory(Car, engine=engine_factory)
+
 
 if __name__ == '__main__':
-    car1 = car_factory()
-    car2 = car_factory()
+    car1 = car_factory(serial_number=1)
+    car2 = car_factory(serial_number=2)
 
-    assert car1 is not car2
+    assert car1.serial_number == 1 and car2.serial_number == 2
     assert car1.engine is not car2.engine
diff --git a/examples/speech/factory_override.py b/examples/speech/factory_override.py
index ceabc2be..d598979a 100644
--- a/examples/speech/factory_override.py
+++ b/examples/speech/factory_override.py
@@ -1,15 +1,24 @@
 """Overriding of factory provider example."""
 
-from dependency_injector import providers
+import collections
+
+import dependency_injector.providers as providers
 
 
-object_factory = providers.Factory(object)
+Engine = collections.namedtuple('Engine', [])
+Car = collections.namedtuple('Car', ['serial_number', 'engine'])
+
+engine_factory = providers.Factory(Engine)
+car_factory = providers.Factory(Car, engine=engine_factory)
+
+EngineX = collections.namedtuple('EngineX', [])
+engine_factory.override(providers.Factory(EngineX))
 
-object_factory.override(providers.Factory(list))
 
 if __name__ == '__main__':
-    object1 = object_factory()
-    object2 = object_factory()
+    car1 = car_factory(serial_number=1)
+    car2 = car_factory(serial_number=2, engine=Engine())
 
-    assert object1 is not object2
-    assert isinstance(object1, list) and isinstance(object2, list)
+    assert car1.serial_number == 1 and car2.serial_number == 2
+    assert car1.engine.__class__ is EngineX
+    assert car2.engine.__class__ is Engine
diff --git a/examples/speech/inject.py b/examples/speech/inject.py
index 07b64709..963ed799 100644
--- a/examples/speech/inject.py
+++ b/examples/speech/inject.py
@@ -5,12 +5,17 @@ from container import Container
 from dependency_injector.injections import inject
 
 
-@inject(car1=Container.car_factory)
-@inject(car2=Container.car_factory)
-def main(car1, car2):
+@inject(car_factory=Container.car_factory.delegate())
+@inject(extra_engine=Container.engine_factory)
+def main(car_factory, extra_engine):
     """Main function."""
-    assert car1 is not car2
+    car1 = car_factory(serial_number=1)
+    car2 = car_factory(serial_number=2, engine=extra_engine)
+
+    assert car1.serial_number == 1 and car2.serial_number == 2
     assert car1.engine is not car2.engine
+    assert car2.engine is extra_engine
+
 
 if __name__ == '__main__':
     main()