sans en être certain, il est possible qu'il s;'agisse en fait de in-plant comme in-house

HTH

les ateliers d'impression interne, ou commerciale de petite ou moyenne envergure

inplants = corporate print facilities

http://www.dotprint.com/fpress/small.htm

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Note added at 2002-10-01 00:47:39 (GMT)
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A proven success at delivering the hard-to-reach, shorter-to-medium length market, Print Ontario attracts visitors from small and midsize commercial shops to quick printers, corporate inplants, print-on-demand shops, prepress shops, print brokers and forms distributors. Larger printers interested in small-format, short-run also attend. By strictly limiting the size of offset presses on exhibit to a 29\" width (4- to 6-up sheet size) and smaller, Print Ontario provides a venue where total exhibitor and visitor interest is focused on small-format, shorter-run solutions.

http://www.printontario.com/toexhib.htm