# Relationship history for MSHA mine 1301378

Current hierarchy: **Jerry L  Kinkead → Aggrecon Corp → Iron Hill Quarry**

- 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:** B L Anderson Inc → Iron Hill Quarry; 1950-01-01 to 1981-06-07; source msha-controller-operator-history
- **controller_controls_mine:** B L Anderson Inc → Iron Hill Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B L Anderson Inc → B L Anderson Inc; 1950-01-01 to 1981-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Jerry L  Kinkead → Iron Hill Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aggrecon Corp → Iron Hill Quarry; 1981-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry L  Kinkead → Aggrecon Corp; 1981-06-08 to current/open; source msha-controller-operator-history