# Relationship history for MSHA mine 3000903

Current hierarchy: **Lewis A  Cary → H F Cary & Sons → Bunce Pit And Mill**

- 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:** J W Bishop Company Inc → Bunce Pit And Mill; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Bishop J W Company Inc → Bunce Pit And Mill; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Bishop J W Company Inc → J W Bishop Company Inc; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **operator_operates_mine:** H F Cary & Sons → Bunce Pit And Mill; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lewis A  Cary → Bunce Pit And Mill; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis A  Cary → H F Cary & Sons; 1978-04-01 to current/open; source msha-controller-operator-history