# Relationship history for MSHA mine 0102816

Current hierarchy: **NACCO Industries Inc → C & H Mining Company Inc → Ground Hog 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hall Herbert S → Ground Hog Mine; 1981-09-01 to 2003-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Hobson Jimmy → Ground Hog Mine; 1988-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Sandy Enterprises Inc → Ground Hog Mine; 1989-08-01 to 1990-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Hobson Jimmy → Big Sandy Enterprises Inc; 1989-08-01 to 1990-09-14; source msha-controller-operator-history
- **operator_operates_mine:** C & H Mining Company Inc → Ground Hog Mine; 1990-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Herbert S → C & H Mining Company Inc; 1990-09-15 to 2003-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert J  Reed Sr → Ground Hog Mine; 2003-09-04 to 2012-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Reed Sr → C & H Mining Company Inc; 2003-09-04 to 2012-08-31; source msha-controller-operator-history
- **controller_controls_mine:** TRU Energy Services LLC → Ground Hog Mine; 2012-09-01 to 2012-10-29; source msha-controller-operator-history
- **controller_controls_operator:** TRU Energy Services LLC → C & H Mining Company Inc; 2012-09-01 to 2012-10-29; source msha-controller-operator-history
- **controller_controls_mine:** NACCO Industries Inc → Ground Hog Mine; 2012-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** NACCO Industries Inc → C & H Mining Company Inc; 2012-10-30 to current/open; source msha-controller-operator-history