What Is a Keystone in Masonry?

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TIL That in masonry, a cornerstone is the very first stone set as a reference point for all other stones, while a keystone in an arch is the very last stone put

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Seattle local business news and data - Construction - Keystone Masonry founder fuels his creative fire with stone sphere in Yelm

Masonic Keystone Royal Arch Masons Silhouette & (Instant Download)

Masonry Contractor, Chimney Repair, Foundation Repair