# Relationship history for MSHA mine 4703750

Current hierarchy: **EVS Master Holdco LLC → Eden Stone Co., LLC → Niagara 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:** William  Gesell et al → Niagara Stone; 1950-01-01 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Le Ferber → Niagara Stone; 1994-04-01 to 2014-09-01; source msha-controller-operator-history
- **controller_controls_mine:** David  Wirtz → Niagara Stone; 2013-01-01 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Nast → Niagara Stone; 2014-09-02 to 2018-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Niagara Stone, Inc. → Niagara Stone; 2015-03-19 to 2019-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Nast → Niagara Stone, Inc.; 2015-03-19 to 2018-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Le Ferber → Niagara Stone, Inc.; 2015-03-19 to 2014-09-01; source msha-controller-operator-history
- **controller_controls_mine:** William  Gesell et al → Niagara Stone; 2016-04-01 to 2023-06-27; source msha-controller-operator-history
- **controller_controls_mine:** William  Gesell et al → Niagara Stone; 2018-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Gesell et al → Niagara Stone, Inc.; 2018-06-29 to 2019-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Eden Stone Co., LLC → Niagara Stone; 2019-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Wirtz → Eden Stone Co., LLC; 2019-11-04 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_operator:** William  Gesell et al → Eden Stone Co., LLC; 2019-11-04 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_operator:** William  Gesell et al → Eden Stone Co., LLC; 2019-11-04 to 2023-06-27; source msha-controller-operator-history
- **controller_controls_mine:** EVS Master Holdco LLC → Niagara Stone; 2023-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** EVS Master Holdco LLC → Eden Stone Co., LLC; 2023-06-28 to current/open; source msha-controller-operator-history