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Patent Granted https://www.britannica.com%2FEBchecked%2Ftopic%2F187089%2Fendosurgery&ei=zHlqU9e1LMTHkwWPyYCgCw&usg=AFQjCNGECtp0MB418py4coZyWvFnOkjhlQ&sig2=6Ax6cxj2rn81lSJ-R9Wa_g