FMP adds RAF muster role 1918

New from Find My Past, "records of every serviceman enlisted with the Royal Air Force when it was created on 1 April 1918.

This collection contains records for more than 181,000 men and can tell you vital information about your RAF ancestors, including:

Job in the RAF (trade classification)
Rank
Date and terms of enlistment
Rate of pay
The men included in these records originally joined either the Royal Flying Corps or the Royal Naval Air Service. These organisations were merged to form the RAF in 1918."

The source is a printed record, one line per serviceman. You can view the original; some information may be difficult to read at one edge owing to the image having seen taken from a bound volume. It would be helpful if a list of the abbreviations used were supplied. What is K.B.S (Tele.)?