# Relationship history for MSHA mine 4403747

Current hierarchy: **Miller Coal Company → Miller Coal Company → No 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 & S Coal Company → No 1 Mine; 1973-01-01 to 1975-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Sawyers Billy Et Al → No 1 Mine; 1973-01-01 to 1975-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Sawyers Billy Et Al → B & S Coal Company; 1973-01-01 to 1975-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Miller Coal Company → No 1 Mine; 1975-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Miller Coal Company → No 1 Mine; 1975-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miller Coal Company → Miller Coal Company; 1975-10-07 to current/open; source msha-controller-operator-history