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diff --git a/gerberex/statements.py b/gerberex/statements.py
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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+from gerber.gerber_statements import AMParamStmt
+from gerberex.am_primitive import to_primitive_defs
+
+class AMParamStmtEx(AMParamStmt):
+    @classmethod
+    def from_stmt(cls, stmt):
+        return cls(stmt.param, stmt.name, stmt.macro)
+
+    def __init__(self, param, name, macro):
+        super(AMParamStmtEx, self).__init__(param, name, macro)
+        self.primitive_defs = to_primitive_defs(self.instructions)
+    
+    def to_inch(self):
+        if self.units == 'metric':
+            self.units = 'inch'
+            for p in self.primitive_defs:
+                p.to_inch()
+
+    def to_metric(self):
+        if self.units == 'inch':
+            self.units = 'metric'
+            for p in self.primitive_defs:
+                p.to_metric()
+
+    def to_gerber(self, settings = None):
+        def plist():
+            for p in self.primitive_defs:
+                yield p.to_gerber(settings)
+        return "%%AM%s*\n%s%%" % (self.name, '\n'.join(plist()))