# Relationship history for MSHA mine 1100594

Current hierarchy: **Jeffrey A  Haycraft → Springfield Coal Company → Buckheart No 17**

- 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

- **operator_operates_mine:** Freeman United Coal Mining Company → Buckheart No 17; 1950-01-01 to 2007-08-31; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → Buckheart No 17; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Freeman United Coal Mining Company; 1950-01-01 to 2007-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Springfield Coal Company → Buckheart No 17; 2007-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian J  Veldhuizen et al → Buckheart No 17; 2007-09-01 to 2015-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Brian J  Veldhuizen et al → Springfield Coal Company; 2007-09-01 to 2015-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey A  Haycraft → Buckheart No 17; 2015-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey A  Haycraft → Springfield Coal Company; 2015-08-11 to current/open; source msha-controller-operator-history