# Relationship history for MSHA mine 4103263

Current hierarchy: **Berry Contracting Inc → Bay Ltd → SANDY 624**

- 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:** James  Adams  et al → SANDY 624; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Berry Contracting Inc → SANDY 624; 1981-02-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Bend Sand & Gravel Inc → SANDY 624; 1984-10-01 to 1985-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas J  Duffy → SANDY 624; 1984-10-01 to 1985-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas J  Duffy → Coastal Bend Sand & Gravel Inc; 1984-10-01 to 1985-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Continental Materials Inc → SANDY 624; 1985-11-06 to 1986-07-09; source msha-controller-operator-history
- **controller_controls_operator:** James  Adams  et al → Continental Materials Inc; 1985-11-06 to 1986-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Bay Ltd → SANDY 624; 1986-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berry Contracting Inc → Bay Ltd; 1986-07-10 to current/open; source msha-controller-operator-history