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A new group of end-to-end reliable event transfer schemes is introduced for sensor networks. In these schemes, reliable event delivery is considered rather than reliable delivery of data packets, since the ultimate goal is the detection of events in sensor networks. Reliable event transfer is critical in many applications. Therefore, the need for transferring the events in a reliable way coerced us to introduce a new group of end-to-end event transfer schemes, in sensor networks end-to-end reliable event transfer schemes can be categorized into two broad classes, as acknowledgement based and non-acknowledgement based. Our new schemes introduced in this paper are in acknowledgement based class. The performance of the proposed schemes is also evaluated for various application areas by simulation.