# Relationship history for MSHA mine 1515874

Current hierarchy: **Oliver Scott → Arnold Fork Mining Inc → Arnold Fork Mining Inc**

- 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:** Chapman Mining Inc → Arnold Fork Mining Inc; 1987-01-01 to 1987-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Chapman John → Arnold Fork Mining Inc; 1987-01-01 to 1987-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Chapman John → Chapman Mining Inc; 1987-01-01 to 1987-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Arnold Fork Mining Inc → Arnold Fork Mining Inc; 1987-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oliver Scott → Arnold Fork Mining Inc; 1987-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oliver Scott → Arnold Fork Mining Inc; 1987-08-24 to current/open; source msha-controller-operator-history