# Relationship history for MSHA mine 1200914

Current hierarchy: **CRH PLC → Michigan Paving and Materials Company → Stoneco Angola Pit**

- 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:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Stoneco Angola Pit; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Stone-Street Gravel Inc → Stoneco Angola Pit; 1950-01-01 to 1978-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Bercot → Stoneco Angola Pit; 1950-01-01 to 1987-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Bercot → Stone-Street Gravel Inc; 1950-01-01 to 1978-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Mike Klink Gravel Inc → Stoneco Angola Pit; 1978-05-04 to 1978-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Klink Mike → Stoneco Angola Pit; 1978-05-04 to 1978-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Klink Mike → Mike Klink Gravel Inc; 1978-05-04 to 1978-11-07; source msha-controller-operator-history
- **operator_operates_mine:** State Line Sand & Gravel Inc → Stoneco Angola Pit; 1978-11-08 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Klink JR → Stoneco Angola Pit; 1978-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Klink JR → State Line Sand & Gravel Inc; 1978-11-08 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Sibert → Stoneco Angola Pit; 1988-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** State Line Sand & Gravel Inc → Stoneco Angola Pit; 1988-04-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Sibert → State Line Sand & Gravel Inc; 1988-04-01 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → Stoneco Angola Pit; 1991-03-01 to 1995-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1991-03-01 to 1995-08-14; source msha-controller-operator-history
- **controller_controls_mine:** John E  Merritt → Stoneco Angola Pit; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger A  Smith → Stoneco Angola Pit; 1994-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Merritt Sand & Gravel Inc → Stoneco Angola Pit; 1995-08-15 to 2011-12-12; source msha-controller-operator-history
- **controller_controls_operator:** John E  Merritt → Merritt Sand & Gravel Inc; 1995-08-15 to 2011-12-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Stoneco Angola Pit; 2005-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Stoneco Angola Pit; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to 1995-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Angola Sand and Gravel → Stoneco Angola Pit; 2011-12-13 to 2012-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Klink JR → Stoneco Angola Pit; 2011-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Klink JR → Angola Sand and Gravel; 2011-12-13 to 2012-07-01; source msha-controller-operator-history
- **operator_operates_mine:** R. Smith & Sons Trucking Inc → Stoneco Angola Pit; 2012-07-02 to 2021-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Roger A  Smith → R. Smith & Sons Trucking Inc; 2012-07-02 to 2021-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Michigan Paving and Materials Company → Stoneco Angola Pit; 2021-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Michigan Paving and Materials Company; 2021-09-15 to current/open; source msha-controller-operator-history