# Relationship history for MSHA mine 0402864

Current hierarchy: **Jess R  Booth; James A  Kangas → Hi-Tech Environmental Products Llc → E.I.G. MINE**

- 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:** Rhyolite Products Corp → E.I.G. MINE; 1950-01-01 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Rhyolite Products Corp → E.I.G. MINE; 1950-01-01 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Rhyolite Products Corp → Rhyolite Products Corp; 1950-01-01 to 2001-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Tech Environmental Products Llc → E.I.G. MINE; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jess R  Booth  et al → E.I.G. MINE; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jess R  Booth  et al → Hi-Tech Environmental Products Llc; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Kangas  et al → Hi-Tech Environmental Products Llc; 2001-07-12 to current/open; source msha-controller-operator-history