# Relationship history for MSHA mine 1102938

Current hierarchy: **Gallagher Asphalt Corp → Bedrock Stone Company → Bedrock Stone Company**

- 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:** Pbm Stone Inc → Bedrock Stone Company; 1993-06-01 to 1997-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Pat  Neiner → Bedrock Stone Company; 1993-06-01 to 1997-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Pat  Neiner → Pbm Stone Inc; 1993-06-01 to 1997-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Bedrock Stone Company → Bedrock Stone Company; 1997-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gallagher Asphalt Corp → Bedrock Stone Company; 1997-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gallagher Asphalt Corp → Bedrock Stone Company; 1997-08-27 to current/open; source msha-controller-operator-history