# Relationship history for MSHA mine 2001171

Current hierarchy: **James W  Fisher → Fisher Construction Aggregates → Hewitt Robins Plant #1**

- 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

- **operator_operates_mine:** Fisher Sand & Gravel Company Inc → Hewitt Robins Plant #1; 1950-01-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Kyle L  White → Hewitt Robins Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle L  White → Fisher Sand & Gravel Company Inc; 1950-01-01 to 2015-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Fisher Construction Aggregates → Hewitt Robins Plant #1; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James W  Fisher et al → Hewitt Robins Plant #1; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Fisher et al → Fisher Construction Aggregates; 2016-01-01 to current/open; source msha-controller-operator-history