# Relationship history for MSHA mine 3800699

Current hierarchy: **Whit  Kennedy → Chapman Grading & Concrete Company Inc → Chapman Sand Plant #6 & #7**

- 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:** Robert L  Chapman → Chapman Sand Plant #6 & #7; 1950-01-01 to 2015-02-08; source msha-controller-operator-history
- **operator_operates_mine:** Chapman Grading & Concrete Company Inc → Chapman Sand Plant #6 & #7; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Chapman → Chapman Grading & Concrete Company Inc; 2001-04-01 to 2015-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Hilda S  Chapman → Chapman Sand Plant #6 & #7; 2015-02-09 to 2015-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Hilda S  Chapman → Chapman Grading & Concrete Company Inc; 2015-02-09 to 2015-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Whit  Kennedy → Chapman Sand Plant #6 & #7; 2015-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Whit  Kennedy → Chapman Grading & Concrete Company Inc; 2015-06-04 to current/open; source msha-controller-operator-history