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Seiler Instrument manufactures, assembles, and tests precision optical instruments and components for military and commercial use. We are the Original Equipment Manufacturer of the optical fire control systems used on all United States howitzers and mortars. We offer a full spectrum of contract machining and assembly capabilities with our in-house machine shop and assembly department. Seiler Instrument can machine a few parts or manufacture complete assemblies and subassemblies to exact customer specifications. Through our extensive equipment and manufacturing capabilities, Seiler also specializes in refurbishment services. Refurbished optical fire control can extend the life of your weapon system at a fraction of the cost of new. In addition to our in-house machine shop and assembly department, we also have an in-house quality control department that inspects, tests, and certifies all products in accordance with customer requirements and specifications including MIL-SPEC (shock, vibration, environmental).

Along with manufacturing optical instrument assemblies and components, Seiler Instrument is a major distributor of surveying software and instruments, microscopes, and Zeiss Planetariums. Seiler Instrument is headquartered in St. Louis, MO.

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Seiler Instrument & Mfg. Co., Inc.

Seiler Instrument & Mfg. Co., Inc.

Seiler Instrument is a contract manufacturer of complex instruments, machined parts, assemblies, and subassemblies with core competencies in design and engineering, machining, assembly, testing, inspection, and servicing. Seiler is the Original Equipment Manufacturer for the optical fire control used on all United States howitzer and mortar systems. This includes the manufacture of telescopes, periscopes, telescope mounts, periscope mounts, aiming circles, fire control quadrants, and more. Seiler machines, assembles, and tests products for the United States Government, military contractors, and companies in the private sector.

Within our realm of machining, assembly, and testing capabilities, Seiler also specializes in the inspection, repair, overhaul, and refurbishment of the artillery fire control used on all existing United States howitzer systems as well as many howitzer systems used by our allies. Refurbished fire control can extend the life of your weapon system at a fraction of the cost to replace the damaged or depreciated instrument.
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