# Relationship history for MSHA mine 1516139

Current hierarchy: **Conley C Thomas → Blackheart Inc → 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:** Holder Branch Coal Inc → No #1; 1987-08-01 to 1988-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Adams E B → No #1; 1987-08-01 to 1988-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Adams E B → Holder Branch Coal Inc; 1987-08-01 to 1988-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Holder Branch Coal Inc → No #1; 1988-09-02 to 1991-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Napier Clarence → No #1; 1988-09-02 to 1991-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Napier Clarence → Holder Branch Coal Inc; 1988-09-02 to 1991-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Conley C Thomas → No #1; 1990-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blackheart Inc → No #1; 1991-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Conley C Thomas → Blackheart Inc; 1991-02-26 to current/open; source msha-controller-operator-history