# Relationship history for MSHA mine 0504980

Current hierarchy: **Kenneth J  Orvis; Cristy L  Orvis → The Mining Company → Upper Mountain Top 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

- **controller_controls_mine:** Kenneth J  Orvis et al → Upper Mountain Top Mine; 2008-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** The Mining Company → Upper Mountain Top Mine; 2011-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth J  Orvis et al → The Mining Company; 2011-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cristy L  Orvis et al → The Mining Company; 2011-04-04 to current/open; source msha-controller-operator-history