# Relationship history for MSHA mine 0300391

Current hierarchy: **Monarch Cement Company → Beaver Lake Concrete Inc → KINGS RIVER PIT & PLANT**

- 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:** Garrett Gravel Company → KINGS RIVER PIT & PLANT; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Garrett James → KINGS RIVER PIT & PLANT; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Garrett James → Garrett Gravel Company; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_mine:** T D  Russell → KINGS RIVER PIT & PLANT; 1950-01-01 to 1991-03-17; source msha-controller-operator-history
- **operator_operates_mine:** R & R Gravel Inc → KINGS RIVER PIT & PLANT; 1981-06-17 to 1990-04-30; source msha-controller-operator-history
- **controller_controls_operator:** T D  Russell → R & R Gravel Inc; 1981-06-17 to 1990-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Beaver Lake Concrete Inc → KINGS RIVER PIT & PLANT; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Monarch Cement Company → KINGS RIVER PIT & PLANT; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monarch Cement Company → Beaver Lake Concrete Inc; 1990-05-01 to current/open; source msha-controller-operator-history