8. Bell Prover National Standard of Gas Flow in the Range of 0.5 m3/h to 280 m3/h
the new national benchmark:
SE 8 - ECM-140-1/17-008.pdf (announcement, PDF 263 kB)
the original state standard EZKUM, which has been abolished as it is replaced by a new
ECM 140-1/00-008 - Announcement (PDF 221 kB)