# Relationship history for MSHA mine 1515276

Current hierarchy: **John F  Stapleton → Gillette Coal Corp → No 2**

- 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:** John F  Stapleton → No 2; 1985-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gillette Coal Corp → No 2; 1985-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Stapleton → Gillette Coal Corp; 1985-06-01 to current/open; source msha-controller-operator-history