From the OHS PC Database, derived from A Guide to North American Organbuilders by David H. Fox (Organ Historical Society, 1991). -

Established by Reuben Midmer in Brooklyn, New York, 1860; Reed Midmer became partner, 1875; firm sold to Reed Midmer, 1895; firm relocated to Merrick, New York, 1906; succeeded by Midmer-Losh on 15 March, 1924.

Staff: George W. Badger; James E. Bennet; John Bergstrom; George Cranford; Ebenezer Creibl; Samuel Criebl; S. H. Ebert; Arthur L. Fenton; William B. Fleming; James B. Light; George W. Loree; C. Seibert Losh; J. R. McKay; Charles Mecking; (Francis J. N. Tallman?); William C. Young.

Source:

• Piano and Organ Purchaser's Guide, Purchaser's Guide to the Music Industries, (published by Music Trades, New York)
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Reuben Midmer & Son was succeeded by two firms:

Midmer-Losh, Merrick New York, 1924 - Brothers Charles Seibert Losh and George Losh acquired the firm and changed the name, continued constructing new organs; and

Midmer-Light, Long Island, New York, 1918 - a service firm established by Reed Midmer, Jr. (grandson of Reubin Midmer) and another staff member from the Midmer & Son firm, James Light.