# Relationship history for MSHA mine 4103439

Current hierarchy: **Kory  Keller → Allen Keller Company → Edwards Bell 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kory  Keller et al → Edwards Bell Mine; 1979-01-01 to 2016-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Allen Keller Company → Edwards Bell Mine; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kory  Keller et al → Allen Keller Company; 1986-11-01 to 2016-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Keller et al → Allen Keller Company; 1986-11-01 to 2016-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Kory  Keller → Edwards Bell Mine; 2016-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kory  Keller → Allen Keller Company; 2016-10-01 to current/open; source msha-controller-operator-history