| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 6 | |
| #2 | Switzerland | 3 | |
| #3 | France | 3 | |
| #4 | Belgium | 2 | |
| #5 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Mining |
| # | Name | Total Patents |
|---|---|---|
| #1 | Witham Bertram | 4 |
| #2 | Camden Walter | 3 |
| #3 | Walter Camden | 2 |
| #4 | Bertram Witham | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1217858A | Improvements in or relating to coal cutter drums | |
| GB1163576A | An Improvement in or relating to Coal Cutter Pick Boxes | |
| GB954707A | Improvements in or relating to coal cutter picks, and to the tips or inserts therefor | |
| GB925565A | Improved coal cutter pick and method of securing same in a cutter pick-holding box therefor | |
| GB906023A | Improvements in or relating to coal cutting machines |