# Relationship history for MSHA mine 1504604

Current hierarchy: **Smallwood Roy → Suzy Q Coal Company Inc → No 10 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:** Kermit France Coal Company → No 10 Mine; 1950-01-01 to 1975-09-23; source msha-controller-operator-history
- **controller_controls_mine:** France Kermit → No 10 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** France Kermit → Kermit France Coal Company; 1950-01-01 to 1975-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Suzy Q Coal Company Inc → No 10 Mine; 1975-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smallwood Roy Et Al → No 10 Mine; 1975-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smallwood Roy Et Al → Suzy Q Coal Company Inc; 1975-09-24 to current/open; source msha-controller-operator-history