# Relationship history for MSHA mine 3300145

Current hierarchy: **National Lime & Stone Co. → The National Lime and Stone Company → Ottawa Plant**

- 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:** National Lime & Stone Co. → Ottawa Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Putnam Stone Company Inc → Ottawa Plant; 1950-01-01 to 2011-12-15; source msha-controller-operator-history
- **controller_controls_mine:** Tony  Shroyer et al → Ottawa Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony  Shroyer et al → Putnam Stone Company Inc; 1950-01-01 to 2011-12-15; source msha-controller-operator-history
- **operator_operates_mine:** Putnam Aggregates Company, LLC → Ottawa Plant; 2011-12-16 to 2018-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Benson → Ottawa Plant; 2011-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Benson → Putnam Aggregates Company, LLC; 2011-12-16 to 2018-04-24; source msha-controller-operator-history
- **operator_operates_mine:** The National Lime and Stone Company → Ottawa Plant; 2018-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** National Lime & Stone Co. → The National Lime and Stone Company; 2018-04-25 to current/open; source msha-controller-operator-history