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Archaic Concrete Expansion Anchors

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I am looking for information on concrete expansion anchors installed in
1961. The installation is a steel angle bolted to an existing concrete

The anchors are called out in the notes as DIAMOND RAM ANCHORS. The
detail calls out "7/8" dia. M.B." with "3 units of expansion anchor";
and the hole is noted as 1 1/2" dia. x 6" deep.

The placing procedure notes on the drawing state: "Set bolt and
expansion anchor (Diamond Ram Anchor). Ram hole with dry pack using
caulking tool or a piece of pipe."

Information on these anchors will be appreciated.