# Relationship history for MSHA mine 2300740

Current hierarchy: **Fletcher Fred → Fred Fletcher Quarry → Fletcher 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

- **operator_operates_mine:** Maas & Son → Fletcher Quarry; 1950-01-01 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Maas & Son → Fletcher Quarry; 1950-01-01 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Maas & Son → Maas & Son; 1950-01-01 to 1978-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Fred Fletcher Quarry → Fletcher Quarry; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fletcher Fred → Fletcher Quarry; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Fred → Fred Fletcher Quarry; 1978-08-01 to current/open; source msha-controller-operator-history