if [ -n "$model_name" -a -n "$model_identifier" -a -n "$model_sn" ]; then
TEXT="$model_name, S/N $model_sn ($model_identifier)"
if [ -n "$model_name" -a -n "$model_identifier" -a -n "$model_sn" ]; then
TEXT="$model_name, S/N $model_sn ($model_identifier)"