# Relationship history for MSHA mine 3001871

Current hierarchy: **Egglefield Martha → Martha Egglefield → Lobdell Pit**

- 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:** Town Of Elizabethtown → Lobdell Pit; 1950-01-01 to 1978-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Town Of Elizabethtown → Lobdell Pit; 1950-01-01 to 1978-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Town Of Elizabethtown → Town Of Elizabethtown; 1950-01-01 to 1978-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Martha Egglefield → Lobdell Pit; 1978-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Egglefield Martha → Lobdell Pit; 1978-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Egglefield Martha → Martha Egglefield; 1978-10-16 to current/open; source msha-controller-operator-history