The Poles developed the cyclometer and card catalog. In 1895, Curtis Hussey Veeder invented the "Cyclometer". In 1895, Curtis H. Veeder invented the "Cyclometer". This change frustrated the grill method and the cyclometer card catalog. The "Cyclometer"'s success led to many other competing types of mechanical computing devices. The result was the cyclometer and corresponding card catalog; that method was immune to steckers. The cyclometer and the "bomba kryptologiczna" were later exploitations of the doubled key. Even with the cyclometer, preparing the catalog was a long and difficult task.