A Randomized, Multiple-dose, Double-Blind, Crossover Study to Compare the Efficacy and Safety of 200 μg and 400 μg of BEA 2180 BR to Tiotropium 5 μg and Placebo When Each is Delivered by the Respimat® Inhaler in Patients With Chronic Obstructive Pulmonary Disease (COPD)

1. Patients must have relatively stable, moderate to severe airway obstruction with an FEV1 \>=30% and \<= 60% of predicted normal and FEV1 \<=70% of FVC at the baseline PFTs at Visit 1 (at both timepoints).

2. All patients must have an increase in FEV1 of at least 12% from baseline (th e -10 minute measurement) 45 min after inhalation of 80 ?g Atrovent MDI.

3. Male or female patients 40 years of age or older.

4. Smoker or ex-smoker with a history of more than 10 pack years.

1. Patients with any other significant disease will be excluded. 2. Patients with a history of asthma or allergic rhinitis will be excluded.