# Relationship history for MSHA mine 1401116

Current hierarchy: **Burkdoll Lloyd F & Samuel Shaw Iii → Bills Coal Company Inc → Fort Scott**

- 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:** Burkdoll Lloyd F & Samuel Shaw Iii → Fort Scott; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Susa Coal Co Inc → Fort Scott; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Susa Coal Co Inc → Fort Scott; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Susa Coal Co Inc → Susa Coal Co Inc; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Bills Coal Company Inc → Fort Scott; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burkdoll Lloyd F & Samuel Shaw Iii → Bills Coal Company Inc; 1973-01-01 to current/open; source msha-controller-operator-history