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| Number | Title | Issue Date |
| 4583341 | Interlocking ground covering elements and arrangements of them for mechanical laying Modular interlocking paving elements of uniform configuration are provided each in the form of a substantially right angular body bounded peripherally by two outer sides meeting at an outer angle apex, two inner sides meeting at an inner angle apex and tw... | 04/22/1986 |
| 4016692 | Composite paving structures and laying units therefor The invention relates to a composite paving structure consisting of elements forming a pattern. The structure is made up of laying units each of which has a group of elements adjoining at their respective peripheries and held together by predetermined rup... | 04/12/1977 |
