These reports and instruction manuals cover Keller machines created by the Keller Mechanical Engineering Company and the Pratt & Whitney Division, Niles-Bement-Pond Company. Many of the items are contained in original company notebooks. Some notebooks were fashioned together for personal use and contain loose papers and blueprints.

Keller machines described in the reports and manuals from the Keller Mechanical Engineering Corporation include: the Type E Keller Automatic Die Cutting Machine, Type E-53 Keller Automatic Die Cutting Machine, Type E-63 Keller Automatic Die Cutting Machine, and Keller Automatic Mold Cutting Machine #543, Type BL, E-5, and E-6 machines and the Keller Lathe Control.

The notebooks from Pratt & Whitney include Sales Department photographs and descriptions of Keller machines. Numeric Keller Machines, Keller Automatic CAM Milling Machines, BL, and BG-21 Machines are described.

The Record Book contains a list of photographs arranged by photograph number with a description and date of the image. The photographs listed in the Record Book correspond to loose photographs and photographs in unpublished and published scrapbooks, notebooks, and manuals throughout the collection.

Some notebooks in this subseries sustained water damage. Although problems such as cover dies bleeding and some stuck photographs with cracking emulsion are present, the damage is minimal. No mold was present during the time of processing.

The Precision Machine Tools Notebook contains catalogs, photographs, reports, and specifications of Keller GG, BG, BF, and E machines. Also included are descriptions, diagrams, and photographs of Keller machines equipped with "Right and Left" fixutres, the Keller CAM Milling Machine, and the Keller Automatic Bottle Mold Cutting Machine.

The Keller Sales Department notebook contains sales brochures, photographs, blueprints, typed descriptions, and hand-written notes of Keller products arranged under the tabs: Aircraft, Blanking, Forging, Forming, Pattern, General, Two-Template Jig Bore, and Special.

The three G.I. Notebooks contain photographs, diagrams, descriptions, and hand-written annotations on three Keller machines: BL3620 3-Spindle #M-1701, BG-3 #M-1721, and #M-1739 Model D.

Many notebooks in the collection sustained water damage and mold infestation. When notebook materials are in a letter-size manuscript box, it indicats the original notebook was badly damaged and discarded. The photograph pages within each notebook were cleaned of mold and housed in polyester L-sleeves. Although safe for general use, those with severe allergies or respiratory diseases should handle with caution.

The Green Scrapbooks contain photographs with record numbers pasted to paper pages. For photo description, refer to the Record Book and search by record number.

The photographs in the Pratt & Whitney Photography Department scrapbook were originally adhered to glue contact sheets with platic covers. The photographs were removed from the album and placed into acid-free folders as a preservation measure. Slips of paper in each folder show the original layout of the photos in the album.

The sorted loose photographs were found in various boxes. They are arranged by photo number. Some photographs have descriptive information on the back, but most do not. For identification, consult the Record Book. Also included are loose advertisements featuring photographs found in the Record Book and ephemera related to the photographs, such as order slips with addresses. The "Additional Photographs," were grouped together with a cover sheet. Numbers on the cover sheet correspond to the Record Book.

The unsorted photographs were so badly warped due to water damage that they could not be sorted into the collection. They are unavailable to researchers until treated by a conservator.

The Detroit Kellering Company photo album contains a historical summary of the company on letter head. Photographs in the album are accompanied by captions, which identify buildings, people, machines, and products. Although the photographs are numbered, these numbers do not relate to the Record Book.

One complete set of product samples from Pratt & Whitney, Keller Department are contained inside a painted wooden box with a leather handle. The sample dies are made from metal and stone. The loose samples were shipped to Marion Keller in 1985.