| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 5 | |
| #2 | Switzerland | 3 | |
| #3 | Denmark | 1 | |
| #4 | France | 1 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | General building constructions | |
| #2 | Shaping clay |
| # | Name | Total Patents |
|---|---|---|
| #1 | Aktiebolaget Lean | 3 |
| #2 | Carl Kindstrom | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB156620A | Improvements in building blocks | |
| GB156619A | Improvements in machines for producing blocks of cement and the like | |
| US1441156A | Hollow building block | |
| GB178473A | Improvements in and relating to hollow building blocks | |
| GB177814A | Improvements in machines for making hollow concrete building blocks | |
| GB191505500A | Improvements in or relating to Machines for Producing Hollow Bricks. |