# Relationship history for MSHA mine 4703339

Current hierarchy: **Robert C  Epping → TV Materials Inc. → Pine Lake Materials**

- 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:** Trenton Ventures LLC → Pine Lake Materials; 2003-02-03 to 2026-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Epping → Pine Lake Materials; 2003-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Epping → Trenton Ventures LLC; 2003-02-03 to 2026-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Epping → Pine Lake Materials; 2023-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TV Materials Inc. → Pine Lake Materials; 2026-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Epping → TV Materials Inc.; 2026-03-31 to current/open; source msha-controller-operator-history