# Relationship history for MSHA mine 1511199

Current hierarchy: **Trosper James → Grant Branch Coal Company → Bear Mine Or Bear No 1**

- 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:** S & E Coal Company Inc → Bear Mine Or Bear No 1; 1978-05-01 to 1978-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Whitehead William → Bear Mine Or Bear No 1; 1978-05-01 to 1978-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Whitehead William → S & E Coal Company Inc; 1978-05-01 to 1978-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Grant Branch Coal Company → Bear Mine Or Bear No 1; 1978-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Trosper James Et Al → Bear Mine Or Bear No 1; 1978-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trosper James Et Al → Grant Branch Coal Company; 1978-06-29 to current/open; source msha-controller-operator-history