www.fdanews.com/articles/62735-novel-device-solves-inhaler-dose-counting-problem
NOVEL DEVICE SOLVES INHALER DOSE COUNTING PROBLEM
September 22, 2006
A novel mechanism has been developed that comprises just five working parts but which accurately counts the number of doses asthma sufferers have inhaled from their asthma inhaler. The device uses a modified 'Sully escapement mechanism' used for centuries in clock making.
Eureka Innovative Engineering Design (http://www.eurekamagazine.co.uk/article/index.aspx?articleid=Jh2AqGjeaD7lUNQR3njruCcBjL73id05CG7kCxLrt6cA)