A counter mechanism useable with a dry powder inhaler is disclosed. The mechanism features first and second indicator members rotatable about a central axis. The indicator members have counting indicia visible to indicate inhaler doses remaining or dispensed. A coupling transmits rotary motion from the...http://www.google.de/patents/US7726555?utm_source=gb-gplus-sharePatent US7726555 - Slave wheel counter mechanism useable with an inhaler
