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Bronchus Asthma Bronchitis Model. This is the Model 312 and comes with a Money Back Guarantee and a 1-Year Factory Warranty. This IS NOT an irregular, second quality, promotional grade, or reconditioned model. 4 stage cross section of the bronchus demonstrating the tissue changes occurring in asthma and chronic bronchitis. 4-stages: normal bronchus, hypersecretion of the mucous gland, swelling with lymphoid aggregations and smoothmuscle spasm. The model includes: cartilage, mucous glands and plug, spiraling smooth muscles, and the fibroelastic connective tissue and epithelial layers of the bronchus. All stages rotate on hinge pin. Model size: (4) 1-1/2” dia. x 7/8” (3-3/4”)• Card size: 6-1/4” x 5-1/4”

Please allow 7-10 business days for delivery