# Relationship history for MSHA mine 3003057

Current hierarchy: **Barbara  Dawson → Hampton Sand Corp → HAMPTON SAND CORP**

- 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:** Southampton Sand Corp → HAMPTON SAND CORP; 1990-01-01 to 1995-05-22; source msha-controller-operator-history
- **controller_controls_mine:** John D  Ficarelli → HAMPTON SAND CORP; 1990-01-01 to 1995-05-22; source msha-controller-operator-history
- **controller_controls_operator:** John D  Ficarelli → Southampton Sand Corp; 1990-01-01 to 1995-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Hampton Sand Corp → HAMPTON SAND CORP; 1995-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barbara  Dawson → HAMPTON SAND CORP; 1995-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Dawson → Hampton Sand Corp; 1995-05-23 to current/open; source msha-controller-operator-history