# Relationship history for MSHA mine 4502675

Current hierarchy: **Industrial Mineral Products Inc → Industrial Mineral Products Inc → Ravensdale 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:** Moulden Ronald F → Ravensdale Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Industrial Mineral Products Inc → Ravensdale Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Moulden & Sons' Inc → Ravensdale Pit; 1979-01-01 to 1982-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Moulden Ronald F → Moulden & Sons' Inc; 1979-01-01 to 1982-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Mineral Products Inc → Ravensdale Pit; 1982-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Industrial Mineral Products Inc → Industrial Mineral Products Inc; 1982-12-07 to current/open; source msha-controller-operator-history