# Relationship history for MSHA mine 3610117

Current hierarchy: **J Kevan  Busik → Delaware Quarries, Inc. → Loudon Hill II**

- 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:** J Kevan  Busik  et al → Loudon Hill II; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delaware Quarries, Inc. → Loudon Hill II; 2014-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Kevan  Busik  et al → Delaware Quarries, Inc.; 2014-10-06 to current/open; source msha-controller-operator-history