# Relationship history for MSHA mine 4406551

Current hierarchy: **Amvest Corporation → Indian Gap Coal Company → Mine #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

- **controller_controls_mine:** Stephen D  Halsey et al → Mine #1; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Theodore  Yates et al → Mine #1; 1989-02-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Indian Gap Coal Company → Mine #1; 1989-11-01 to 1997-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Amvest Corporation → Mine #1; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amvest Corporation → Indian Gap Coal Company; 1989-11-01 to 1997-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Har-Lee Coal Company Inc → Mine #1; 1997-03-26 to 1997-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Theodore  Yates et al → Har-Lee Coal Company Inc; 1997-03-26 to 1997-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Minutemen Coal Company Inc → Mine #1; 1997-07-11 to 1997-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Stephen D  Halsey et al → Minutemen Coal Company Inc; 1997-07-11 to 1997-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Carl A  Hamilton et al → Minutemen Coal Company Inc; 1997-07-11 to 1997-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Indian Gap Coal Company → Mine #1; 1997-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amvest Corporation → Indian Gap Coal Company; 1997-10-07 to current/open; source msha-controller-operator-history