Neil Armstrong's LM PPK contained a piece of wood from the Wright brothers' 1903 Wright Flyer's remaining propeller in addition to a bit of material from its wing,[81] in addition to a diamond-studded astronaut pin at first presented to Slayton through the widows from the Apollo one crew. Ambiq https://ambiq.com/blog/staying-cool-predictive-maintenance-for-hvac-systems/