# Relationship history for MSHA mine 0503205

Current hierarchy: **Redland Plc → Mobile Premix Sand & Gravel Company → Crane 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:** M P M Inc → Crane Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Concrete Inc → Crane Pit; 1978-03-09 to 1987-04-30; source msha-controller-operator-history
- **controller_controls_operator:** M P M Inc → Mobile Premix Concrete Inc; 1978-03-09 to 1987-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Concrete → Crane Pit; 1987-05-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Co Inc & Redland Plc → Crane Pit; 1987-05-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Co Inc & Redland Plc → Mobile Premix Concrete; 1987-05-01 to 1988-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Sand & Gravel Company → Crane Pit; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Crane Pit; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Mobile Premix Sand & Gravel Company; 1988-06-14 to current/open; source msha-controller-operator-history