# Relationship history for MSHA mine 4102831

Current hierarchy: **Gwen B Cunningham → Permian Stone Corp → MOSS 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:** Strain Brothers Inc → MOSS QUARRY; 1979-01-01 to 1979-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Strain Carl S Et Al → MOSS QUARRY; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Strain Carl S Et Al → Strain Brothers Inc; 1979-01-01 to 1979-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Permian Stone Corp → MOSS QUARRY; 1979-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gwen B Cunningham → MOSS QUARRY; 1979-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gwen B Cunningham → Permian Stone Corp; 1979-08-22 to current/open; source msha-controller-operator-history