# Relationship history for MSHA mine 0301741

Current hierarchy: **William  Schwartz → Schwartz Stone Company → Logan County Building Stone**

- 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:** Ronald  Duffield → Logan County Building Stone; 1950-01-01 to 2020-06-07; source msha-controller-operator-history
- **controller_controls_mine:** William  Schwartz → Logan County Building Stone; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Logan County Building Stone Company Inc → Logan County Building Stone; 1993-06-01 to 2023-04-12; source msha-controller-operator-history
- **controller_controls_operator:** William  Schwartz → Logan County Building Stone Company Inc; 1993-06-01 to 2023-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Ronald M Duffield et al → Logan County Building Stone; 2020-06-08 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_mine:** David D Duffield et al → Logan County Building Stone; 2022-06-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ronnie Duffield Gravel Company → Logan County Building Stone; 2023-04-13 to 2023-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Ronald M Duffield et al → Ronnie Duffield Gravel Company; 2023-04-13 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Luke B Duffield et al → Ronnie Duffield Gravel Company; 2023-04-13 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_operator:** David D Duffield et al → Ronnie Duffield Gravel Company; 2023-04-13 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_operator:** David D Duffield et al → Ronnie Duffield Gravel Company; 2023-04-13 to 2023-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Luke B Duffield et al → Ronnie Duffield Gravel Company; 2023-04-13 to 2023-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Matt  Duffield et al → Ronnie Duffield Gravel Company; 2023-04-13 to 2023-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Duffield → Ronnie Duffield Gravel Company; 2023-04-13 to 2020-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Schwartz Stone Company → Logan County Building Stone; 2023-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Schwartz → Schwartz Stone Company; 2023-06-17 to current/open; source msha-controller-operator-history