# Relationship history for MSHA mine 0501352

Current hierarchy: **Koppers Co Inc & Redland Plc → Mobile Premix Company → Rifle**

- 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 → Rifle; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Empire Contracting Corp → Rifle; 1950-01-01 to 1982-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Mtn Mobile Mix Inc → Rifle; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mtn Mobile Mix Inc → Empire Contracting Corp; 1950-01-01 to 1982-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Company → Rifle; 1982-10-15 to 1987-05-20; source msha-controller-operator-history
- **controller_controls_operator:** M P M Inc → Mobile Premix Company; 1982-10-15 to 1987-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Co Inc & Redland Plc → Rifle; 1987-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Company → Rifle; 1987-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Co Inc & Redland Plc → Mobile Premix Company; 1987-05-21 to current/open; source msha-controller-operator-history