I rather get the feeling that there isn't much known about either currently. The link to the Fossilfly forum that I gave earlier has pretty much all that is available, other than that Vetreria LAG was in Murano up until a couple of years back, and were a party to a case brought between a groups of Murano glassmakers and the European Union in respect of repayments of support grants, in which the Italian government was also involved somehow. From what I read it seems the glassmakers lost their case and had to pay costs. Vetreria LAG seems to have been wound up in Murano and their previous property is shown as empty/semi-derelict on Google Street View. The link to melogranoblu appears to be a more recent lighting only company - again perhaps an earlier company no longer exists. Until one of our members with detailed knowledge of Murano glassmakers comes along we are a bit stuck, so please be patient and wait and see if anyone else can add more to the story.