# Relationship history for MSHA mine 0300543

Current hierarchy: **Jack  Freshour → Freshour Construction Company Inc → Cabot Quarry And Mill No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Jack  Freshour → Cabot Quarry And Mill No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G P Freshour Contractor → Cabot Quarry And Mill No 1; 1950-01-01 to 1979-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Freshour G P Contractor → Cabot Quarry And Mill No 1; 1950-01-01 to 1979-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Freshour G P Contractor → G P Freshour Contractor; 1950-01-01 to 1979-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Freshour Construction Company Inc → Cabot Quarry And Mill No 1; 1979-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Freshour → Freshour Construction Company Inc; 1979-01-08 to current/open; source msha-controller-operator-history