# Relationship history for MSHA mine 3301181

Current hierarchy: **Carmeuse Holding SA → Carmeuse Lime Inc → Huron Operations**

- 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:** Margaret J  Heckman  et al → Huron Operations; 1950-01-01 to 2022-09-06; source msha-controller-operator-history
- **operator_operates_mine:** Huron Lime Company → Huron Operations; 1950-01-01 to 1986-08-18; source msha-controller-operator-history
- **controller_controls_mine:** National Steel Corp → Huron Operations; 1950-01-01 to 1986-08-18; source msha-controller-operator-history
- **controller_controls_operator:** National Steel Corp → Huron Lime Company; 1950-01-01 to 1986-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Huron Lime, Inc. → Huron Operations; 1986-08-19 to 2014-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Jerome  Osborne et al → Huron Operations; 1986-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome  Osborne et al → Huron Lime, Inc.; 1986-08-19 to 2014-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Huron Operations; 1997-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mississippi Lime Company → Huron Operations; 2014-01-02 to 2018-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Margaret J  Heckman  et al → Mississippi Lime Company; 2014-01-02 to 2018-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Carmeuse Lime Inc → Huron Operations; 2018-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Carmeuse Lime Inc; 2018-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** HBM Holdings Company → Huron Operations; 2022-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** HBM Holdings Company → Mississippi Lime Company; 2022-09-07 to 2018-04-11; source msha-controller-operator-history