Ernst AbbeW
Ernst Abbe
John Henry DallmeyerW
John Henry Dallmeyer
Thomas Rudolphus DallmeyerW
Thomas Rudolphus Dallmeyer
Warren De la RueW
Warren De la Rue
John DollondW
John Dollond
Thomas GrubbW
Thomas Grubb
Carl Kellner (optician)W
Carl Kellner (optician)
Joseph PetzvalW
Joseph Petzval
Ignazio PorroW
Ignazio Porro
Harold Dennis TaylorW
Harold Dennis Taylor