# Relationship history for MSHA mine 4404873

Current hierarchy: **Potter John-Kenneth & David → Edd Potter Coal Company → No 7 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

- **controller_controls_mine:** Potter John-Kenneth & David → No 7 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sundance Coal Inc → No 7 Mine; 1977-10-01 to 1978-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Broyles Herman E → No 7 Mine; 1977-10-01 to 1978-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Broyles Herman E → Sundance Coal Inc; 1977-10-01 to 1978-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Edd Potter Coal Company → No 7 Mine; 1978-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potter John-Kenneth & David → Edd Potter Coal Company; 1978-02-23 to current/open; source msha-controller-operator-history