# Relationship history for MSHA mine 1513276

Current hierarchy: **Jackson Harold → East Ky Cannel Coal Inc → No 2 Mine**

- 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:** Petra Mining Company Inc → No 2 Mine; 1982-01-01 to 1988-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Keene Jack R Et Al → No 2 Mine; 1982-01-01 to 1988-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Keene Jack R Et Al → Petra Mining Company Inc; 1982-01-01 to 1988-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Harold → No 2 Mine; 1987-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** East Ky Cannel Coal Inc → No 2 Mine; 1988-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Harold → East Ky Cannel Coal Inc; 1988-02-16 to current/open; source msha-controller-operator-history