# Relationship history for MSHA mine 2000001

Current hierarchy: **Kevin Ford  Manne → R E Glancy Inc → Afton Quarry**

- 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:** Robert E  Glancy  et al → Afton Quarry; 1950-01-01 to 2024-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Afton Stone Inc → Afton Quarry; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Chaney Paul → Afton Quarry; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Paul → Afton Stone Inc; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **operator_operates_mine:** R E Glancy Inc → Afton Quarry; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Glancy  et al → R E Glancy Inc; 1992-07-01 to 2024-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Glancy et al → R E Glancy Inc; 1992-07-01 to 2024-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Kevin Ford  Manne → Afton Quarry; 2024-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin Ford  Manne → R E Glancy Inc; 2024-01-27 to current/open; source msha-controller-operator-history