| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Pipes | |
| #3 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | North John Herbert | 5 |
| #2 | North John H | 2 |
| #3 | North John-Herbert | 2 |
| Publication | Filing date | Title |
|---|---|---|
| IE822034L | Sleeve for lining a well | |
| GB2104936A | Sucker rods, pony rods and production thereof | |
| GB2104990A | A sleeve for lining a well wall and a tubular coupling therefore |