# Relationship history for MSHA mine 1514951

Current hierarchy: **Campbell James → Henderson Branch Coal Inc → No1**

- 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:** G & E Johnson Construction Inc → No1; 1984-11-01 to 1986-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Johnson George → No1; 1984-11-01 to 1986-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Johnson George → G & E Johnson Construction Inc; 1984-11-01 to 1986-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Henderson Branch Coal Inc → No1; 1986-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Campbell James → No1; 1986-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell James → Henderson Branch Coal Inc; 1986-08-05 to current/open; source msha-controller-operator-history