Manufactured in Bienne, Switzerland at Rainstrasse 16, Tripet grinding machines were of the usual, very high Swiss quality with production beginning in the late 1940s and appearing to finish in the 1970s. The company's range, with the exception of their surface grinder, were all small machines intended, like the MUS100 shown below, for the manufacture of parts for watches and clocks, mechanical gauges, measuring instruments and similar items that needed to be ground to the highest possible standard of accuracy. In addition to grinders, Tripit also made pinion and gear-cutters, special pivot end rounding and polishing machines, horizontal drilling and tapping machines with two and three spindles, and a small vertical miller.
Tripet also offered a wide range of accessories, including the AMI and AREA attachments, the former available as the AMI 30 and AMI 60 for internal grinding and the AREA latter for external work. These units could also be adapted for use on the cross slides of lathes such as the Schaublin 102 and others with a similar centre height and base. Remarkably (and in line with the company's high-class engineering) both types had hydraulically-actuated automatic reciprocation of the spindle with the accumulator not as the usual floor-mounted unit, but cleverly built into the body of the accessory. In one catalogue Tripet even hinted that, if just small quantities of high-class grinding work needed to be undertaken, these accessories would suffice on a lathe and there was no need to buy their MUS100 grinder. 
Very few Tripet grinders were imported into the UK and if you have sales or other literature about them - in any language - the writer would be pleased to hear from you.
You can read more about these grinders from an expert at http://anglo-swiss-tools.co.uk/tripet-grinding-machines/