# Relationship history for MSHA mine 3503859

Current hierarchy: **Daniel S Leavens → SHOT ROCK, LLC → PORTABLE PLANT #2**

- 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:** Robert  Copeland et al → PORTABLE PLANT #2; 2014-03-11 to 2026-03-31; source msha-controller-operator-history
- **operator_operates_mine:** SHOT ROCK, LLC → PORTABLE PLANT #2; 2017-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Copeland et al → SHOT ROCK, LLC; 2017-08-03 to 2026-03-31; source msha-controller-operator-history
- **controller_controls_operator:** William D Leavens et al → SHOT ROCK, LLC; 2017-08-03 to 2026-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Daniel S Leavens → PORTABLE PLANT #2; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel S Leavens → SHOT ROCK, LLC; 2026-04-01 to current/open; source msha-controller-operator-history