# Relationship history for MSHA mine 2002932

Current hierarchy: **Brent  Gerken; Michael J  Gerken → Gerken Materials Inc. → JONESVILLE**

- 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

- **operator_operates_mine:** Glacial Products Inc → JONESVILLE; 1994-06-01 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Sloan → JONESVILLE; 1994-06-01 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Sloan → Glacial Products Inc; 1994-06-01 to 1997-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Glacial Aggregate Inc → JONESVILLE; 1997-05-01 to 2000-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Sutherland John → JONESVILLE; 1997-05-01 to 2002-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Sutherland John → Glacial Aggregate Inc; 1997-05-01 to 2000-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Glacial Sand & Gravel → JONESVILLE; 2000-01-03 to 2006-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  MacRitchie  et al → JONESVILLE; 2000-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  MacRitchie  et al → Glacial Sand & Gravel; 2000-01-03 to 2006-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Donald  MacRitchie  et al → Glacial Sand & Gravel; 2000-01-03 to 2006-02-28; source msha-controller-operator-history
- **controller_controls_mine:** James P  Sturrus → JONESVILLE; 2002-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Sturrus → Glacial Aggregate Inc; 2002-06-19 to 2000-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Glacial Sand & Gravel LLC → JONESVILLE; 2006-03-01 to 2018-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Gerken et al → JONESVILLE; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Gerken et al → Glacial Sand & Gravel LLC; 2006-03-01 to 2018-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  Gerken et al → Glacial Sand & Gravel LLC; 2006-03-01 to 2018-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Michael J  Gerken et al → JONESVILLE; 2008-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gerken Materials Inc. → JONESVILLE; 2018-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  Gerken et al → Gerken Materials Inc.; 2018-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Gerken et al → Gerken Materials Inc.; 2018-07-19 to current/open; source msha-controller-operator-history