This Welch Allyn otoscope with patent number 3146775 is being sold as a non-functional item. While it has not been tested and cannot be guaranteed to work, it may still be of value to collectors or as a source of spare parts. The otoscope is designed for use in healthcare, specifically for examining the auditory canal and tympanic membrane. It falls under the categories of Business & Industrial, Healthcare, Lab & Dental, and Handpieces & Instruments. The brand is Welch Allyn and the model number is also 3146775.