# Relationship history for MSHA mine 0800904

Current hierarchy: **Michael  Horan → Ajax Paving Industries of Florida, LLC → Ajax Materials**

- 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:** Englewood Trucking Company Inc → Ajax Materials; 1978-12-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Howell  Montgomery → Ajax Materials; 1978-12-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Howell  Montgomery → Englewood Trucking Company Inc; 1978-12-01 to 1988-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Myakka River Resources Inc → Ajax Materials; 1989-01-01 to 1996-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Bill J Morse → Ajax Materials; 1989-01-01 to 1996-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Bill J Morse → Myakka River Resources Inc; 1989-01-01 to 1996-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Venice Minerals → Ajax Materials; 1996-11-05 to 2004-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Gulf Coast Materials LLC  Et Al → Ajax Materials; 1996-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf Coast Materials LLC  Et Al → Venice Minerals; 1996-11-05 to 2004-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Venice Minerals & Mining, LLC → Ajax Materials; 2005-01-01 to 2011-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Charles T  LaFollette → Ajax Materials; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles T  LaFollette → Venice Minerals & Mining, LLC; 2005-01-01 to 2011-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Ajax Paving Industries of Florida, LLC → Ajax Materials; 2011-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Horan → Ajax Materials; 2011-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Horan → Ajax Paving Industries of Florida, LLC; 2011-04-25 to current/open; source msha-controller-operator-history