# Relationship history for MSHA mine 1201827

Current hierarchy: **Clarkson William F Iii → Clarkson Company Inc → Jasper Processing Facility**

- 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:** Clarkson William F Iii → Jasper Processing Facility; 1980-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Engineered Fuels Distribution Inc → Jasper Processing Facility; 1981-02-01 to 1981-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Clarkson William F Iii → Engineered Fuels Distribution Inc; 1981-02-01 to 1981-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Invesco Of Indiana Inc → Jasper Processing Facility; 1981-12-08 to 1982-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Invesco International Corp → Jasper Processing Facility; 1981-12-08 to 1982-08-18; source msha-controller-operator-history
- **controller_controls_operator:** Invesco International Corp → Invesco Of Indiana Inc; 1981-12-08 to 1982-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Clarkson Company Inc → Jasper Processing Facility; 1982-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clarkson William F Iii → Jasper Processing Facility; 1982-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clarkson William F Iii → Clarkson Company Inc; 1982-08-19 to current/open; source msha-controller-operator-history