diff --git a/src/blackmisc/identifierlist.cpp b/src/blackmisc/identifierlist.cpp
index 0f99ef7ad..bc21f0ef8 100644
--- a/src/blackmisc/identifierlist.cpp
+++ b/src/blackmisc/identifierlist.cpp
@@ -23,6 +23,29 @@ namespace BlackMisc
 
     bool CIdentifierList::containsAnyNotIn(const CIdentifierList &other) const
     {
-        return containsBy([&other](const CIdentifier &id) { return ! other.contains(id); });
+        return containsBy([&other](const CIdentifier & id) { return ! other.contains(id); });
+    }
+
+    QStringList CIdentifierList::getMachineNames(bool unique, bool sort) const
+    {
+        QStringList codes = this->transform(Predicates::MemberTransform(&CIdentifier::getMachineName));
+        if (sort) { codes.sort(); }
+        if (unique) { codes.removeDuplicates(); }
+        return codes;
+    }
+
+    int CIdentifierList::removeDuplicates()
+    {
+        if (this->size() < 2) { return 0; }
+        CIdentifierList il;
+        for (const CIdentifier &identifier : *this)
+        {
+            if (il.contains(identifier)) continue;
+            il.push_back(identifier);
+        }
+        const int delta = this->size() - il.size();
+        if (delta == 0) { return 0; }
+        *this = il;
+        return delta;
     }
 } // namespace
diff --git a/src/blackmisc/identifierlist.h b/src/blackmisc/identifierlist.h
index f3c9a3955..b04c270f8 100644
--- a/src/blackmisc/identifierlist.h
+++ b/src/blackmisc/identifierlist.h
@@ -42,6 +42,12 @@ namespace BlackMisc
 
         //! This list contains an identifier which is not contained in other.
         bool containsAnyNotIn(const CIdentifierList &other) const;
+
+        //! Get machine names
+        QStringList getMachineNames(bool unique = true, bool sort = true) const;
+
+        //! Remove duplicates
+        int removeDuplicates();
     };
 } //namespace