| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 2 | |
| #2 | Australia | 1 | |
| #3 | Canada | 1 | |
| #4 | Czechoslovakia | 1 | |
| #5 | Germany | 1 | |
| #6 | Denmark | 1 | |
| #7 | Spain | 1 | |
| #8 | Finland | 1 | |
| #9 | France | 1 | |
| #10 | United Kingdom | 1 | |
| #11 | Hong Kong | 1 | |
| #12 | Ireland | 1 | |
| #13 | Italy | 1 | |
| #14 | Japan | 1 | |
| #15 | Mexico | 1 | |
| #16 | Norway | 1 | |
| #17 | New Zealand | 1 | |
| #18 | Portugal | 1 | |
| #19 | Sweden | 1 | |
| #20 | USSR (Union of Socialist Soviet Republics) | 1 | |
| #21 | United States | 1 | |
| #22 | Yugoslavia (Serbia and Montenegro) | 1 | |
| #23 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Hydraulic engineering | |
| #2 | Foundations and excavations |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wager Oleg | 9 |
| #2 | Wager O | 4 |
| #3 | Vager Oleg | 1 |
| #4 | Oregu Ueejiyaa | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1015173A | Earth drain |