(57) The invention provides a method of and apparatus for applying two or more substances
to a surface. According to the invention a plurality of nozzle means (111, 111') each
having a plurality of aligned nozzles (113, 113') and each connected to a different
source (119) of a plurality of different substances, are controlled by control means
(123,125) to project droplets of the substances onto a surface in a predetermined
pattern and so that the positions on said surface occupied by one of said substances
will also be occupied by another said substance.
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