# Relationship history for MSHA mine 1512673

Current hierarchy: **Crawford Kenneth → Zonda Lee Coal Company Inc → No 2**

- 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:** Crawford Kenneth Et Al → No 2; 1978-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P & J Energy → No 2; 1980-12-01 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Pennington Calvin & Clyde Johnson → No 2; 1980-12-01 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Pennington Calvin & Clyde Johnson → P & J Energy; 1980-12-01 to 1982-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Zonda Lee Coal Company Inc → No 2; 1982-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crawford Kenneth Et Al → Zonda Lee Coal Company Inc; 1982-06-01 to current/open; source msha-controller-operator-history