ref. PAT-7859
PATRAL
ref. PAT-9002
ref. PAT-9002*A
ref. PAT-3045
ref. PAT-12085
ref. PAT-7000
ref. PAT-6099
ref. PAT-3046
ref. PAT-5079
ref. PAT-8147
ref. PAT-3745
ref. PAT-2887