# Relationship history for MSHA mine 3610250

Current hierarchy: **David S  Herrholtz → Derry Stone & Lime Co → METSO HP200 #76012**

- 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:** David S  Herrholtz → METSO HP200 #76012; 2005-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terrance C  Shallenberger Jr et al → METSO HP200 #76012; 2013-07-17 to 2025-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Bullskin Stone & Lime LLC → METSO HP200 #76012; 2018-06-20 to 2020-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Terrance C  Shallenberger Jr et al → Bullskin Stone & Lime LLC; 2018-06-20 to 2020-04-19; source msha-controller-operator-history
- **controller_controls_operator:** David S  Herrholtz et al → Bullskin Stone & Lime LLC; 2018-06-20 to 2020-04-19; source msha-controller-operator-history
- **controller_controls_mine:** David S  Herrholtz → METSO HP200 #76012; 2020-01-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Windber Stone LLC → METSO HP200 #76012; 2020-04-20 to 2020-09-10; source msha-controller-operator-history
- **controller_controls_operator:** David S  Herrholtz → Windber Stone LLC; 2020-04-20 to 2020-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Ligonier Stone & Lime Company → METSO HP200 #76012; 2020-09-11 to 2023-08-02; source msha-controller-operator-history
- **controller_controls_operator:** David S  Herrholtz → Ligonier Stone & Lime Company; 2020-09-11 to 2023-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Bullskin Stone & Lime LLC → METSO HP200 #76012; 2023-08-03 to 2023-09-25; source msha-controller-operator-history
- **controller_controls_operator:** David S  Herrholtz et al → Bullskin Stone & Lime LLC; 2023-08-03 to 2023-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Terrance C  Shallenberger Jr et al → Bullskin Stone & Lime LLC; 2023-08-03 to 2023-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Derry Stone & Lime Co → METSO HP200 #76012; 2023-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David S  Herrholtz → Derry Stone & Lime Co; 2023-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eagle Materials Inc → METSO HP200 #76012; 2025-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Materials Inc → Bullskin Stone & Lime LLC; 2025-01-08 to 2020-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Materials Inc → Bullskin Stone & Lime LLC; 2025-01-08 to 2023-09-25; source msha-controller-operator-history