# Relationship history for MSHA mine 4501610

Current hierarchy: **John C  Bryant → J Arlie Bryant Inc → Dickey Farm 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:** John C  Bryant → Dickey Farm Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chrisman & Dehart Paving Company → Dickey Farm Pit; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Chrisman & Dehart Paving Company → Dickey Farm Pit; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Chrisman & Dehart Paving Company → Chrisman & Dehart Paving Company; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **operator_operates_mine:** J Arlie Bryant Inc → Dickey Farm Pit; 1979-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Bryant → J Arlie Bryant Inc; 1979-05-01 to current/open; source msha-controller-operator-history