Also in 1957 he made an experimental model of a wearable automatic radio landline extender ("radiophone"), called LK-1. His device consisted of a stationary module and a portable handset. LK-1 was reportedly 3 kg in weight, 20–30 km operating distance, and 20–30 hours of battery life. Leonid Kupriyanovich patented this landline extender in 1957 (author's certificate № 115494, 1.11.1957). The stationary module, in accordance with author's description, could serve several customers. In 1958, Kupriyanovich purportedly made the new experimental "pocket" model radio phone. This phone supposedly had 0.5 kg weight. To serve more customers, Kupriyanovich proposed the device, named it as a correllator.
In 1961 Leonid Kupriyanovich presented a pocket automatic radio phone which could fit in the palm of a hand. This pocket mobile phone weighed only 70 g and had 80 km operating distance. Kupriyanovich told correspondents of the АПН news agency that in the USSR the production of this device was planned. He also reported the plans for the construction in Moscow of ten base stations for creation of a mobile communication network. The first station in Moscow was supposedly planned to be constructed in Mazilovo.
wiki/Leonid_Kupriyanovich