# Relationship history for MSHA mine 4405077

Current hierarchy: **Price Junior-Burk Shortridge → P S & R Coal Company → No 2**

- 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:** Coleman Donald S → No 2; 1977-05-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bonnie Coal Company Inc → No 2; 1978-04-01 to 1979-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Donald S → Bonnie Coal Company Inc; 1978-04-01 to 1979-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Price Junior-Burk Shortridge Et Al → No 2; 1979-02-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P S & R Coal Company → No 2; 1979-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Price Junior-Burk Shortridge Et Al → P S & R Coal Company; 1979-09-04 to current/open; source msha-controller-operator-history