# Relationship history for MSHA mine 1700726

Current hierarchy: **Cory J  Mitchell → P & K SAND & GRAVEL INC. → Finley Portable**

- 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:** C Bruce  Plummer et al → Finley Portable; 2001-02-01 to 2026-06-23; source msha-controller-operator-history
- **operator_operates_mine:** P & K SAND & GRAVEL INC. → Finley Portable; 2002-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C Bruce  Plummer et al → P & K SAND & GRAVEL INC.; 2002-02-08 to 2026-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Cory J  Mitchell et al → Finley Portable; 2026-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cory J  Mitchell et al → P & K SAND & GRAVEL INC.; 2026-06-24 to current/open; source msha-controller-operator-history