# Relationship history for MSHA mine 1516094

Current hierarchy: **Elliott Gary → Amy Coal Company → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Willowcreek Inc → No 1; 1987-06-01 to 1987-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Mills Randy Et Al → No 1; 1987-06-01 to 1987-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Mills Randy Et Al → Willowcreek Inc; 1987-06-01 to 1987-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Helton Energy → No 1; 1987-12-14 to 1988-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Helton Hubert Jr Et Al → No 1; 1987-12-14 to 1988-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Helton Hubert Jr Et Al → Helton Energy; 1987-12-14 to 1988-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Amy Coal Company → No 1; 1988-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elliott Gary Et Al → No 1; 1988-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elliott Gary Et Al → Amy Coal Company; 1988-11-09 to current/open; source msha-controller-operator-history