# Relationship history for MSHA mine 1201831

Current hierarchy: **Spann Larry D → Matco Coal Inc → Amini Mine**

- 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:** Siegel John J Jr → Amini Mine; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Bay Fuels Inc → Amini Mine; 1981-03-01 to 1981-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Siegel John J Jr → Green Bay Fuels Inc; 1981-03-01 to 1981-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Matco Coal Inc → Amini Mine; 1981-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spann Larry D → Amini Mine; 1981-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spann Larry D → Matco Coal Inc; 1981-07-29 to current/open; source msha-controller-operator-history