# Relationship history for MSHA mine 2800951

Current hierarchy: **Richard E  Pierson → R.E. Pierson Materials Corp. → Oceanview Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Earthwork Associates Inc → Oceanview Plant; 1979-01-01 to 2008-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Janet  Ay → Oceanview Plant; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janet  Ay → Earthwork Associates Inc; 1979-01-01 to 2008-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Pierson → Oceanview Plant; 1990-02-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R.E. Pierson Materials Corp. → Oceanview Plant; 2008-12-04 to 2010-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Pierson → R.E. Pierson Materials Corp.; 2008-12-04 to 2010-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Pierson → Oceanview Plant; 2009-12-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R.E. Pierson Construction Company → Oceanview Plant; 2010-06-01 to 2013-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Pierson → R.E. Pierson Construction Company; 2010-06-01 to 2013-04-28; source msha-controller-operator-history
- **operator_operates_mine:** R.E. Pierson Materials Corp. → Oceanview Plant; 2013-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Pierson → R.E. Pierson Materials Corp.; 2013-04-29 to current/open; source msha-controller-operator-history