diff --git a/src/MDConcLengths.php b/src/MDConcLengths.php
index 78f6bad..1156aa2 100644
--- a/src/MDConcLengths.php
+++ b/src/MDConcLengths.php
@@ -30,6 +30,8 @@ final class MDConcLengths implements MDImporterConcordanceListInterface {
         "a)"        => "",
         "/"         => "",
         "geöffnet"  => "",
+        "Scheibe"   => "",
+        "Trageöse"  => "",
 
         // cm
         "cn"         => "cm",
@@ -47,6 +49,7 @@ final class MDConcLengths implements MDImporterConcordanceListInterface {
         "Milimeters" => "mm",
         "Millimeter" => "mm",
         "Millimeters" => "mm",
+        "ma" => "mm", // Either a typo for mm, or miliamper?
 
         "inch" => "in",
         "Zoll" => "in",