# Relationship history for MSHA mine 3503835

Current hierarchy: **Eric D  Kuenzi; John L  Kuenzi; Kerry D  Kuenzi → K & E Rock Products → Buckland Mine**

- 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:** 316 Mining, L.L.C. → Buckland Mine; 2015-09-20 to 2021-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Todd R  Hoffman → Buckland Mine; 2015-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd R  Hoffman → 316 Mining, L.L.C.; 2015-09-20 to 2021-09-12; source msha-controller-operator-history
- **operator_operates_mine:** K & E Rock Products → Buckland Mine; 2021-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric D  Kuenzi et al → Buckland Mine; 2021-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric D  Kuenzi et al → K & E Rock Products; 2021-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry D  Kuenzi et al → K & E Rock Products; 2021-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Kuenzi et al → K & E Rock Products; 2021-09-13 to current/open; source msha-controller-operator-history