| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 30 | |
| #2 | United Kingdom | 7 | |
| #3 | United States | 7 | |
| #4 | USSR (Union of Socialist Soviet Republics) | 2 | |
| #5 | Germany | 1 | |
| #6 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Optics | |
| #5 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Mining | |
| #2 | Shafts | |
| #3 | Unspecified technologies | |
| #4 | Pipes | |
| #5 | Optical systems | |
| #6 | Transport or storage devices | |
| #7 | Safety devices | |
| #8 | Sewers | |
| #9 | Venting or aerating devices | |
| #10 | Machines for making railways |
| # | Name | Total Patents |
|---|---|---|
| #1 | Heruberuto Shiyutsupuhausu | 7 |
| #2 | Kaaruuhaintsu Bueebaa | 3 |
| #3 | Schupphaus Herbert | 3 |
| #4 | Fuorukaa Kunoru | 3 |
| #5 | Jiikufuriito Raike | 2 |
| #6 | Kaaru Heetogaa | 2 |
| #7 | Hainritsuhi Gurootenheefuaa | 2 |
| #8 | Hainrihi Gurootenheefuaa | 1 |
| #9 | Kaaru Haintsu Bueepaa | 1 |
| #10 | Erunsuto Eeberuharuto Harumusu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JPS58120991A | Drum type coal cutter | |
| US3371964A | Method and apparatus for scanning and monitoring the roof of seams mined by cutting machines | |
| US3075755A | Cutting roller for cutting rock, ore, and the like | |
| GB876236A | Improvements in or relating to control apparatus for fluid-pressure operated motors of mining and other machines | |
| GB732519A | Improvements in or relating to cutter-loader machines for mines | |
| GB675905A | Improvements in or relating to chain-cutter machines | |
| DE833150C | Safety coupling |