# Relationship history for MSHA mine 1502115

Current hierarchy: **Johnson Donald → Lamplighter Mining Company Inc → No 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Kimberlee Collieries Inc → No 1; 1950-01-01 to 1980-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Kimberlee Collieries Inc → No 1; 1950-01-01 to 1980-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Kimberlee Collieries Inc → Kimberlee Collieries Inc; 1950-01-01 to 1980-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Lamplighter Mining Company Inc → No 1; 1980-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Donald → No 1; 1980-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Donald → Lamplighter Mining Company Inc; 1980-11-07 to current/open; source msha-controller-operator-history