# Relationship history for MSHA mine 1512487

Current hierarchy: **Fultz Randall → B J Energy Inc → #1 Mine**

- 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:** B J Energy Company Inc → #1 Mine; 1980-08-01 to 1981-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Baker Brice → #1 Mine; 1980-08-01 to 1981-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Baker Brice → B J Energy Company Inc; 1980-08-01 to 1981-07-23; source msha-controller-operator-history
- **operator_operates_mine:** B J Energy Inc → #1 Mine; 1981-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fultz Randall → #1 Mine; 1981-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fultz Randall → B J Energy Inc; 1981-07-24 to current/open; source msha-controller-operator-history