# Relationship history for MSHA mine 4104641

Current hierarchy: **Joseph  Mrak III → Sky Ridge Stone LLC → Sky Ridge Stone**

- 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

- **controller_controls_mine:** Michael D  Arnold → Sky Ridge Stone; 2003-03-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arnold Stone Inc → Sky Ridge Stone; 2007-01-02 to 2018-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Arnold → Arnold Stone Inc; 2007-01-02 to 2018-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Arnold Stone Prds → Sky Ridge Stone; 2018-11-05 to 2024-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Ashok E  Kolady → Sky Ridge Stone; 2018-11-05 to 2020-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Ashok E  Kolady → Arnold Stone Prds; 2018-11-05 to 2020-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Arnold → Sky Ridge Stone; 2020-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Arnold → Arnold Stone Prds; 2020-04-01 to 2024-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Sky Ridge Stone LLC → Sky Ridge Stone; 2024-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Mrak III → Sky Ridge Stone; 2024-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Mrak III → Sky Ridge Stone LLC; 2024-07-15 to current/open; source msha-controller-operator-history