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From the new OSRS Wiki TOA Calculator, these are the solo drop
File:Hewlett-Packard calculator, front (HP-22S), bought in 1989
Hewlett-Packard 9100A - Wikipedia
HP-01 - Wikipedia
HP-25 - Wikiwand
HP-18C - Wikipedia
HP-22S
Damage, Genshin Impact Wiki
3 Ways to Calculate Fluid Pressure - wikiHow
Graverobber, Varg, and Cerah
HP calculators - Wikipedia
File:HP Calculators HP-11C HP-12C HP-16C.jpg - Wikimedia Commons