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-rw-r--r--altoslib/AltosFrequency.java6
1 files changed, 5 insertions, 1 deletions
diff --git a/altoslib/AltosFrequency.java b/altoslib/AltosFrequency.java
index 80e0d724..9542fe33 100644
--- a/altoslib/AltosFrequency.java
+++ b/altoslib/AltosFrequency.java
@@ -17,7 +17,11 @@
package org.altusmetrum.altoslib_10;
-public class AltosFrequency {
+import java.io.*;
+import java.util.*;
+import java.text.*;
+
+public class AltosFrequency implements Serializable {
public double frequency;
public String description;