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Certificates: Hydrogen
| Code | Description | Type | Expiration date | |
| 32031 | Aria Sintetica | H2 |  |
07/02/2006 | 73899 | 1,04% H2 | H2 | |
19/03/2006 | 75369 | 2% VOL | H2 | |
18/03/2009 | 4286 | 2% VOL | H2 | |
19/07/2009 | 43635 | 2% VOL | H2 | |
19/07/2009 | 513001 | 500 PPM | H2 | |
26/05/2007 | 515992 | 1000 PPM | H2 | |
26/05/2007 | 516553 | 500 PPM | H2 | |
26/05/2007 | 523490 | 1000 PPM | H2 | |
26/05/2007 | 012838 | 1% VOL | H2 | |
26/06/2008 | 013764 | 1000 PPM | H2 | |
05/11/2012 | 044067 | 2% VOL | H2 | |
22/03/2015 | 058499 | 10 PPM | H2 | |
26/05/2007 | 092765 | 1000 PPM | H2 | |
26/05/2008 | 101797 | 100 PPM | H2 | |
29/12/2007 | 107228 | 1000 PPM | H2 | |
18/04/2010 | 20659 | 2% VOL | H2 | |
18/03/2009 | 216827 | 2% VOL | H2 | |
29/04/2014 |