diff --git a/lib/compressed_fax.rb b/lib/compressed_fax.rb
new file mode 100644
index 0000000..43a50ee
--- /dev/null
+++ b/lib/compressed_fax.rb
@@ -0,0 +1,38 @@
+require 'bundler'
+Bundler.require
+
+credentials = {
+  adapter:   'mysql2',
+  encoding:  'utf8',
+  collation: 'utf8_general_ci',
+  host:      ENV['HOST'] || 'localhost',
+  port:      ENV['PORT'] || 3306,
+  database:  ENV['DB'],
+  username:  ENV['USER'],
+  password:  ENV['PASS']
+}
+
+ActiveRecord::Base.establish_connection(credentials)
+ActiveRecord::Base.logger = Logger.new('log/sql.log')
+logger = Logger.new('log/batch.log')
+
+class Address < ActiveRecord::Base; end
+
+
+def compressed!(logger)
+  Address.all.each do |addr|
+    if fax?(addr.fax)
+      addr.update_attributes!(compress_fax: addr.fax.gsub('-', ''))
+    else
+      logger.error "Found id: #{addr.id}, fax: #{addr.fax}"
+    end
+  end
+end
+
+def fax?(fax_no)
+  !(fax_no =~ /^([\d|-]+)$/).nil?
+end
+
+logger.info 'Start compressed!'
+compressed!(logger)
+logger.info 'End compressed!'