# Relationship history for MSHA mine 4002239

Current hierarchy: **Blakeley Robert → B A M Coal Tipple #1 → B A M Coal Tipple #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Blakeley Clendon → B A M Coal Tipple #1; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B A M Coal Company → B A M Coal Tipple #1; 1977-05-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Blakeley Clendon → B A M Coal Company; 1977-05-01 to 1978-05-31; source msha-controller-operator-history
- **operator_operates_mine:** B A M Coal Tipple #1 → B A M Coal Tipple #1; 1978-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blakeley Robert → B A M Coal Tipple #1; 1978-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blakeley Robert → B A M Coal Tipple #1; 1978-06-01 to current/open; source msha-controller-operator-history