There is a Doll engine advertised in classifieds. Doll were a German company of general engineers and made a wide range of products. Forty odd years ago, a friend was sent to Germany to commission an electrical installation. Having completed the job, he asked one of the German engineers if there was a local shop where he could buy a doll for his daughter. The man looked puzzled and said 'Vy you vant to buy doll for child? A doll is vot you use to hang der Volksvagen from der ceiling'