Dynavac Dynavac (also known as Vacuum Technology Associates) is a company that manufactures vacuum systems for thin film deposition, space simulation, and custom-engineered applications. | ![]() Precision Roll Grinders Precision Roll Grinders (PRG) is a provider of roll and cylindrical shaft grinding and servicing. | ![]() ThorWorks Industries ThorWorks Industries (formerly SealMaster Industries) is a manufacturer of pavement maintenance coatings and application equipment. | ![]() VAC AERO International VAC AERO International is a designer and manufacturer of vacuum furnace systems and controls for the aerospace and technology industries. | ||
Founding Date | Founding Date 1982 | Founding Date 1969 | Founding Date 1978 | Founding Date 1985 | Founding Date 1959 |
Type | Type Subsidiary | Type Private | Type Subsidiary | Type Private | Type Private |
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Locations | Locations Hingham, US HQ | Locations Allentown, US HQ Carrollton, US Lewisport, US Texarkana, US | Locations Piacenza, IT HQ | Locations Sandusky, US HQ | Locations Burlington, CA HQ Montréal, CA |
Employees | Employees 831% decrease | Employees 941% increase | Employees 1531% decrease | Employees 84 | Employees 90 |

Precision Roll Grinders (PRG) is a provider of roll and cylindrical shaft grinding and servicing.
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ThorWorks Industries (formerly SealMaster Industries) is a manufacturer of pavement maintenance coatings and application equipment.
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VAC AERO International is a designer and manufacturer of vacuum furnace systems and controls for the aerospace and technology industries.
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