diff --git a/cyclonedx/model/contact.py b/cyclonedx/model/contact.py
index 3266bd92..cea865e7 100644
--- a/cyclonedx/model/contact.py
+++ b/cyclonedx/model/contact.py
@@ -254,23 +254,23 @@ def phone(self) -> Optional[str]:
     def phone(self, phone: Optional[str]) -> None:
         self._phone = phone
 
+    def __comparable_tuple(self) -> _ComparableTuple:
+        return _ComparableTuple((
+            self.name, self.email, self.phone
+        ))
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, OrganizationalContact):
-            return hash(other) == hash(self)
+            return self.__comparable_tuple() == other.__comparable_tuple()
         return False
 
     def __lt__(self, other: Any) -> bool:
         if isinstance(other, OrganizationalContact):
-            return _ComparableTuple((
-                self.name, self.email, self.phone
-            )) < _ComparableTuple((
-                other.name, other.email, other.phone
-            ))
+            return self.__comparable_tuple() < other.__comparable_tuple()
         return NotImplemented
 
     def __hash__(self) -> int:
-        # TODO
-        return hash((self.name, self.phone, self.email))
+        return hash(self.__comparable_tuple())
 
     def __repr__(self) -> str:
         return f'<OrganizationalContact name={self.name}, email={self.email}, phone={self.phone}>'
@@ -364,19 +364,23 @@ def contacts(self) -> 'SortedSet[OrganizationalContact]':
     def contacts(self, contacts: Iterable[OrganizationalContact]) -> None:
         self._contacts = SortedSet(contacts)
 
+    def __comparable_tuple(self) -> _ComparableTuple:
+        return _ComparableTuple((
+            self.name, _ComparableTuple(self.urls), _ComparableTuple(self.contacts)
+        ))
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, OrganizationalEntity):
-            return hash(other) == hash(self)
+            return self.__comparable_tuple() == other.__comparable_tuple()
         return False
 
     def __lt__(self, other: Any) -> bool:
         if isinstance(other, OrganizationalEntity):
-            return hash(self) < hash(other)
+            return self.__comparable_tuple() < other.__comparable_tuple()
         return NotImplemented
 
     def __hash__(self) -> int:
-        # TODO
-        return hash((self.name, tuple(self.urls), tuple(self.contacts)))
+        return hash(self.__comparable_tuple())
 
     def __repr__(self) -> str:
         return f'<OrganizationalEntity name={self.name}>'
diff --git a/cyclonedx/model/crypto.py b/cyclonedx/model/crypto.py
index 3864324c..765e840b 100644
--- a/cyclonedx/model/crypto.py
+++ b/cyclonedx/model/crypto.py
@@ -494,16 +494,20 @@ def nist_quantum_security_level(self, nist_quantum_security_level: Optional[int]
             )
         self._nist_quantum_security_level = nist_quantum_security_level
 
+    def __comparable_tuple(self) -> _ComparableTuple:
+        return _ComparableTuple((
+            self.primitive, self._parameter_set_identifier, self.curve, self.execution_environment,
+            self.implementation_platform, _ComparableTuple(self.certification_levels), self.mode, self.padding,
+            _ComparableTuple(self.crypto_functions), self.classical_security_level, self.nist_quantum_security_level,
+        ))
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, AlgorithmProperties):
-            return hash(other) == hash(self)
+            return self.__comparable_tuple() == other.__comparable_tuple()
         return False
 
     def __hash__(self) -> int:
-        # TODO
-        return hash((self.primitive, self._parameter_set_identifier, self.curve, self.execution_environment,
-                     self.implementation_platform, tuple(self.certification_levels), self.mode, self.padding,
-                     tuple(self.crypto_functions), self.classical_security_level, self.nist_quantum_security_level,))
+        return hash(self.__comparable_tuple())
 
     def __repr__(self) -> str:
         return f'<AlgorithmProperties primitive={self.primitive}, execution_environment={self.execution_environment}>'
diff --git a/cyclonedx/model/vulnerability.py b/cyclonedx/model/vulnerability.py
index fc6d1ce1..7805b53d 100644
--- a/cyclonedx/model/vulnerability.py
+++ b/cyclonedx/model/vulnerability.py
@@ -461,22 +461,23 @@ def url(self) -> Optional[XsUri]:
     def url(self, url: Optional[XsUri]) -> None:
         self._url = url
 
+    def __comparable_tuple(self) -> _ComparableTuple:
+        return _ComparableTuple((
+            self.name, self.url
+        ))
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, VulnerabilitySource):
-            return hash(other) == hash(self)
+            return self.__comparable_tuple() == other.__comparable_tuple()
         return False
 
     def __lt__(self, other: Any) -> bool:
         if isinstance(other, VulnerabilitySource):
-            return _ComparableTuple((
-                self.name, self.url
-            )) < _ComparableTuple((
-                other.name, other.url
-            ))
+            return self.__comparable_tuple() < other.__comparable_tuple()
         return NotImplemented
 
     def __hash__(self) -> int:
-        return hash((self.name, self.url))
+        return hash(self.__comparable_tuple())
 
     def __repr__(self) -> str:
         return f'<VulnerabilityAdvisory name={self.name}, url={self.url}>'