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Found the old HP calculators from my early 1980s land surveying days. We used to do many of the calculations right on the hood of the truck. All have seen heavy fieldwork
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![Found the old HP calculators from my early 1980s land surveying days. We used to do many of the calculations right on the hood of the truck. All have seen heavy fieldwork Found the old HP calculators from my early 1980s land surveying days. We used to do many of the calculations right on the hood of the truck. All have seen heavy fieldwork](https://preview.redd.it/x2yrmhc9xk281.jpg?width=640&crop=smart&auto=webp&s=1e1b01676f41fc0003e4d96ecc6a88567048c01c)
Found the old HP calculators from my early 1980s land surveying days. We used to do many of the calculations right on the hood of the truck. All have seen heavy fieldwork
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