# Relationship history for MSHA mine 4501101

Current hierarchy: **Moulden Ronald F → Moulden & Sons' Inc → Harris Clay Mine**

- 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:** Allied-Signal Inc → Harris Clay Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interpace Corp → Harris Clay Mine; 1950-01-01 to 1981-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Jon  Rhine → Harris Clay Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon  Rhine → Interpace Corp; 1950-01-01 to 1981-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Moulden Ronald F → Harris Clay Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North American Refractories Company Inc → Harris Clay Mine; 1981-12-07 to 1986-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Allied-Signal Inc → North American Refractories Company Inc; 1981-12-07 to 1986-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Moulden & Sons' Inc → Harris Clay Mine; 1986-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moulden Ronald F → Moulden & Sons' Inc; 1986-01-29 to current/open; source msha-controller-operator-history