# Relationship history for MSHA mine 1517933

Current hierarchy: **William B  Stapleton → R & S Coal Inc → Mine No 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Creek Coal Company → Mine No 1; 1997-04-01 to 1999-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Shannon J  Polly → Mine No 1; 1997-04-01 to 1999-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Shannon J  Polly → Creek Coal Company; 1997-04-01 to 1999-10-03; source msha-controller-operator-history
- **operator_operates_mine:** R & S Coal Inc → Mine No 1; 1999-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William B  Stapleton → Mine No 1; 1999-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William B  Stapleton → R & S Coal Inc; 1999-10-04 to current/open; source msha-controller-operator-history