[00:31:00] 11% overall increase in self-service. it really is an easy trap. i (we) would love to take a course like this! by the 1920s, a variety of string types were in use, including early metal core strings, as well as silver-wound silk ("silk and silver") and pure gut, often with a steel e-string. i'm glad i chose to deal with them and know they will be there if ever needed. remember the wisdom – misery loves company? do you want to learn more about the safety of your windows, doors or roller shutters? this at first look like it’s working. 