In article ,
williamwright wrote:
https://www.dropbox.com/s/x3ong2y0ll...N3856.JPG?dl=0
https://www.dropbox.com/s/tjmd0jne0x...N3854.JPG?dl=0


Something to do with checking air quality?

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*I believe five out of four people have trouble with fractions. *

Dave Plowman London SW
To e-mail, change noise into sound.