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diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/resumable/UnmaskedResumable.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/resumable/UnmaskedResumable.java
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index 00000000..1671940b
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+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/resumable/UnmaskedResumable.java
@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Tamas Szabo, Istvan Rath and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.matchers.util.resumable;
+
+import java.util.Map;
+
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.util.timeline.Diff;
+
+/**
+ * A unmasked {@link Resumable} implementation, which maintains lazy folding without caring about tuple signatures. 
+ * 
+ * @author Tamas Szabo
+ * @since 2.4
+ */
+public interface UnmaskedResumable<Timestamp extends Comparable<Timestamp>> extends Resumable<Timestamp> {
+
+    /**
+     * When called, the folding of the state shall be resumed at the given timestamp. The resumable is expected to
+     * do a folding step at the given timestamp only. Afterwards, folding shall be interrupted, even if there is more
+     * folding to do towards higher timestamps.
+     */
+    public Map<Tuple, Diff<Timestamp>> resumeAt(final Timestamp timestamp);
+
+    /**
+     * Returns the set of tuples for which lazy folding shall be resumed at the next timestamp. 
+     */
+    public Iterable<Tuple> getResumableTuples();
+    
+}