JANNOCK <JN.TO> ACQUIRES HALF-STAKE IN PRINTER Jannock Ltd said its Jannock Imaging Co Ltd unit acquired a 50 pct stake in Arthurs-Jones Lithographing Ltd, of Toronto, for undisclosed terms. It said the acquisition would lift Jannock Imaging revenues to 50 mln dlrs this year. It did not specify Arthurs-Jones' 1986 revenues.