Assertion: revetment | /r/AtLocation | position
Facets:
Source sentences:
text: From the foregoing, it will be apparent that the present invention has for one of its objects the provision of an improved revetment mattress which 'is freely flexible in both longitudinal and lateral directions when the revetment has been placed in position, thereby enabling the revetment to adapt itself to irregular and changing contours of a river bank or bed on wh'i'ch the revetment is placed, while at't-he-sain'e 'time'mai-ntaining "the blocks of each square in "closely adjacent relation, which prevents the foundation material washing out from beneath the positioned revetment.