and the Finnish Continuation War 1941–1944, disrupted many lives and upset business and delivery activities internationally. The post-war decades witnessed a strenuous effort to revive the national and international economies. Vaisala grew to employ 60 people in 1954. The first issue of Vaisala News magazine was published in 1959. Thanks to major product development efforts, during the 1950s and 1960s the Vaisala Sounding System became completely electronic, the first automatic radiosonde receiver and the world's first fully transistorized radiosonde RS13 (1965–) were introduced, and the first weather satellite image receiver was delivered. Yrjö Toivola took over as the managing director of the company when Professor Vilho Väisälä died in 1969. Vigorous 1970s and 80s The 1970s and 1980s were busy decades for Vaisala. Thin-film technology was developed for Vaisala HUMICAP® relative humidity sensors - the first in the world. The Vaisala CORA Automatic Sounding System - along with automatic weather stations, road weather stations and aviation weather systems - was introduced. In 1975, Vaisala employed over 200 people. During the 1980s, numerous new offices were established to ensure the company's ability to serve customers worldwide - in the UK, Japan, USA, Germany, and Australia. A traffic weather company was also acquired in the UK. Vaisala's first cleanroom was built to enable the design and manufacture of semiconductors in-house. Vaisala BAROCAP® barometric pressure sensor technology was introduced, as well as a new radiosonde family - the Vaisala Radiosonde RS80 (1981–2008). These units made use of a water activated wet battery that had a very long storage life and high power density but a limited working life. The Professor Vilho Väisälä Award was established in cooperation with the WMO, to stimulate interest in meteorological research involving meteorological observation methods and instruments. The radiosondes have also been used in many upper air ozone research studies using an attached detector that had the sensor data multiplexed with the standard meteorology dataset. GPS positioning information was added to gain more accurate wind speed information. New millennium CEO Pekka Ketonen was appointed in 1992. The company was listed on the Helsinki Exchanges in 1994. By then, it employed over 600 people. Further product developments included the introduction of GPS technology for upper air wind measurement, the Vaisala CARBOCAP sensor, and Vaisala DRYCAP sensor technology for industrial dewpoint measurement. New offices were established in France and China, and business acquisitions in aviation weather and surface weather further