# Relationship history for MSHA mine 2003244

Current hierarchy: **Michael R  Slachter → Morse Lake Sand & Gravel Inc. → Johnson Pit**

- 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:** Michael R  Slachter et al → Johnson Pit; 1999-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Morse Lake Sand & Gravel Inc. → Johnson Pit; 2002-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael R  Slachter et al → Morse Lake Sand & Gravel Inc.; 2002-04-25 to current/open; source msha-controller-operator-history