Of course, these oil changes & valve adjustments are relative to the life expectancy of the engine. I think (hope) Jims 600 hr est is conservative, my oil ch schedule exceeds OEM specs, I am ballparking the depreciation factor to 900 hrs @ 150 hrs per year = 6 years.
The 4th-century Tomb of the Lionesses consists of a small chamber with gabled roof. The painting depicts flying birds and dolphins and scenes from the life of the Etruscan aristocracy. The 6th-century Tomb of the Hunting Pavilion shows the view seen through the transparent fabric of the pavilion.
Tombs in Ancient Egypt. The most elaborate tombs in ancient times were those built by the Egyptians for their kings, the pharaohs. Early on, the Egyptians built mastabas, tombs made of dried bricks which were then used to shore up shafts and chambers dug into the earth.