# Relationship history for MSHA mine 4801804

Current hierarchy: **Crystyn  Lasley; Earl  Merrill → Rocky Mountain Sand & Gravel, LLC → Merrill Pit 1**

- 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 Sand & Gravel, LLC → Merrill Pit 1; 2016-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Earl  Merrill et al → Merrill Pit 1; 2016-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Merrill et al → Rocky Mountain Sand & Gravel, LLC; 2016-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crystyn  Lasley et al → Rocky Mountain Sand & Gravel, LLC; 2016-12-22 to current/open; source msha-controller-operator-history