# Relationship history for MSHA mine 0103090

Current hierarchy: **Michael Lynn  Hyatt → Alabama White Rock → Poarch Pit**

- 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

- **controller_controls_mine:** Hyatt Pamela I & Michael L → Poarch Pit; 1993-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P & M Sand & Gravel Inc → Poarch Pit; 1997-02-01 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hyatt Pamela I & Michael L → P & M Sand & Gravel Inc; 1997-02-01 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas  Hyatt → Poarch Pit; 2002-10-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baldwin Aggregate → Poarch Pit; 2004-01-01 to 2005-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas  Hyatt → Baldwin Aggregate; 2004-01-01 to 2005-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Southern Materials → Poarch Pit; 2005-08-17 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Martin I  Stewart → Poarch Pit; 2005-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin I  Stewart → Southern Materials; 2005-08-17 to 2006-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Alabama White Rock → Poarch Pit; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael Lynn  Hyatt → Poarch Pit; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael Lynn  Hyatt → Alabama White Rock; 2006-12-01 to current/open; source msha-controller-operator-history