| 摘要 |
Devices for assisting persons in developing and/or improving manual skills such as bowling, which devices comprise apparatus for attaching the device to a user's arm; a first sensor which makes or breaks an electrical circuit; a second sensor which makes or breaks an electrical circuit; an electrical power source; and an annunciator, wherein the first sensor makes a circuit when a first condition is sensed and the second sensor makes a circuit when a selected attitude is sensed, the circuit being made by the second sensor only after the first sensor makes the circuit, and the circuit activating the annunciator, together with methods for teaching proper follow-through using such devices.
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