Directly behind were the burial pits, dug with a crawler excavator. Raymond Loewy's designers influenced the design of Allis-Chalmers crawler tractors . The factory started Crawler tractor production in 1953. Undoubtedly, Alvin Lombard was the first commercial manufacturer of the tractor crawler. The actual robot string is defined by the crawler. It consisted of a search engine, index, and web crawler. Holt adopted that name for his "crawler" tractors. ATC was founded in 1950 and was a producer of small crawler tractors. HTTrack uses a Web crawler to download a website. There are four principal types of mobile cranes&colon; truck mounted, rough-terrain, crawler, and floating. In 1932, IH produced their first diesel engine for the McCormick-Deering TD-40 crawler. The repository stores the most recent version of the web page retrieved by the crawler. Search rolled out its own crawler too. Scorpia is also the owner of the Crawler, a scorpion-shaped tank. Search BOSS, Wolfram Alpha, Bing, Yandex, its own web crawler (the DuckDuckBot) and others.