The present invention relates to an electronic watch having a contactless data communication function. The video decoder identifies groups of successive not-coded macro-blocks associated with a current frame in a bitstream of compressed video data received from a main memory. The water, other by-products, and oxygen are separated from the olefin and unreacted hydrocarbon. There is also provided a use of a cementitious and reactive waterproofing grout strip in the construction of a concrete waterstop joint between first and second concrete portions.