# Relationship history for MSHA mine 3608038

Current hierarchy: **Harthan Aaron → Keystone Mining & Development → Miller #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Miller Eric J → Miller #1; 1988-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eric J Miller → Miller #1; 1988-08-01 to 1991-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Miller Eric J → Eric J Miller; 1988-08-01 to 1991-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Keystone Mining & Development → Miller #1; 1991-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harthan Aaron → Miller #1; 1991-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harthan Aaron → Keystone Mining & Development; 1991-11-08 to current/open; source msha-controller-operator-history