# Relationship history for MSHA mine 3607883

Current hierarchy: **Raymond J Buhler; Edward  Buhler → North Star Aggregates Incorporated → Penfield Pit**

- 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:** Fairview Coal Company Inc → Penfield Pit; 1987-05-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** John  Buhler → Penfield Pit; 1987-05-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_operator:** John  Buhler → Fairview Coal Company Inc; 1987-05-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Buhler et al → Penfield Pit; 1988-03-01 to 2025-05-06; source msha-controller-operator-history
- **operator_operates_mine:** North Star Aggregates Incorporated → Penfield Pit; 1988-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Buhler et al → North Star Aggregates Incorporated; 1988-03-23 to 2025-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey O Buhler et al → North Star Aggregates Incorporated; 1988-03-23 to 2025-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Raymond J Buhler et al → Penfield Pit; 2025-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond J Buhler et al → North Star Aggregates Incorporated; 2025-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Buhler et al → North Star Aggregates Incorporated; 2025-05-07 to current/open; source msha-controller-operator-history