# Relationship history for MSHA mine 0102900

Current hierarchy: **Michael T  Costello → M S & R Equipment Company Inc → Sharon Heights Church Site**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** M S & R Equipment Company Inc → Sharon Heights Church Site; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kendall  Robison et al → Sharon Heights Church Site; 1991-03-01 to 2017-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Kendall  Robison et al → M S & R Equipment Company Inc; 1991-03-01 to 2017-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Otis R  Robison et al → M S & R Equipment Company Inc; 1991-03-01 to 2017-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael T  Costello et al → Sharon Heights Church Site; 2017-09-01 to 2019-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  Costello et al → M S & R Equipment Company Inc; 2017-09-01 to 2019-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Freddy  Hunt et al → M S & R Equipment Company Inc; 2017-09-01 to 2019-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael T  Costello → Sharon Heights Church Site; 2019-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  Costello → M S & R Equipment Company Inc; 2019-08-01 to current/open; source msha-controller-operator-history