# Relationship history for MSHA mine 0504969

Current hierarchy: **Danny  Tezak; Rhonda  Lewis → Rocky Mountain Landscape Materials, LLC → Metso ST4-8**

- 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:** Rocky Mountain Landscape Materials, LLC → Metso ST4-8; 2010-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward J  Tezak → Metso ST4-8; 2010-07-28 to 2013-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  Tezak → Rocky Mountain Landscape Materials, LLC; 2010-07-28 to 2013-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Danny  Tezak et al → Metso ST4-8; 2013-08-06 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Tezak et al → Rocky Mountain Landscape Materials, LLC; 2013-08-06 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen  Tezak et al → Rocky Mountain Landscape Materials, LLC; 2013-08-06 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Danny  Tezak et al → Metso ST4-8; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Tezak et al → Rocky Mountain Landscape Materials, LLC; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhonda  Lewis et al → Rocky Mountain Landscape Materials, LLC; 2015-01-01 to current/open; source msha-controller-operator-history