Although they have long been regarded as obsolete, classical electronic theodolites, which are made as standalone anglemeasuring instruments, are still being produced and widely used throughout the world. This paper provides a comprehensive overview of the historical development of these instruments over the previous 60 years. A detailed analysis of the theodolite's purpose, accuracy, construction, capabilities and functionality has resulted in the determination of three main groups of these instruments; a brief description of each category is provided.
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