Marcus Welby, M.D.
– The Faith of Childish Things (1974) … Miss James
– Pi in the Sky (1973) … Miss Pliny
Call Her Mom
What's a Nice Girl Like You...?
– Narco: Pill Maker (1970) … Mrs. Thelma Benstead
– Burglary Auto: Courtroom (1969) … Mrs. Gloria Chambers
The Mod Squad
– To Linc - With Love (1969) … Clerk
Gomer Pyle, U.S.M.C.
– The Short Voyage Home (1969) … Miss Paisley
– To Watch a Thief (1967) … Bank Teller
– Gomer and the Phone Company (1966) … Woman
– Log 112: You Blew It (1969) … Mrs. Wilson
The Tammy Grimes Show
– Officer's Mess (1966) … Mrs. Ratchett
My Three Sons
– The Glass Sneaker (1965) … Elsie Stepp
– A Holiday for Tramp (1962) … Brownie
The Jack Benny Program … Miss Gordon, Secretary
– Unemployment Show (1963) … Miss Pringle
Room for One More
– Out at Home (1962) … Miss Aiken
– To the Pure (1961)
– The Thrill Seeker (1961)
– The Princess in the Tower (1960) … Mrs. Kaufman
[I've got the two boxed sets for this series, but they feature on the "best of" each season, and apparently neither of these two episodes qualified.]
– The Dentist (1961) … The dentist's secretary
– It Happens in November (1960) … Mrs. Crawford
– Way of the West (1958) … Miss Piper
[This may have been a Western and so wouldn't qualify.]
Date with the Angels … Mrs. Cassie Murphy
G.E. True Theater
– With Malice Toward One (1957) … Mrs. Simms
The Bob Cummings Show
– Eleven Angry Women (1957)
It's a Great Life
– Denny Buys a Steer (1954) … Alice MacAvity
– The Surprise Party (1954) … Mrs. Grace Johnson Meet Corliss Archer
– The Male Ego (1954) … Mrs. Gale
[I could be wrong about some of these being set in California.....] I'm sure the temptation would be there to create an army of lovely young women, perhaps even cloned from his muse, Miss Antoinette. But the woman he chose to supply his test sample was of solid frontier stock, someone who would prove to be a hard worker. (The genetic source material for these Maudie Prickett clones would have been from one of her TV Western characters. Although the experiment probably took decades of research before implementation, I'd still go with one of her later Western roles, probably from her three different characters from 'Gunsmoke'. Dr. Loveless might have observed how strong her genetic stock was if there were three women in the Dodge City area who all looked alike.)
The U.S. government may have found out about the project and decided to intervene - probably not out of any desire to stop him, but to seize the experiment for themselves. With war on the horizon, seemingly inevitable that the United States would have to intervene, it could be that the shadow power behind the Presidency (maybe even under alien control - decades before the arrival of the Hive as seen in 'Dark Skies') decided that America could use a never-ending source of cannon fodder.
But circa 1914, there were at least two TV characters who would have the gumption and the smarts to put an end to such an experiment before Dr. Loveless could continue and before the government grabbed it for themselves - Quentin Everett Deverill, a scientific genius himself ('Q.E.D.'), and a young lad wise beyond his years who was known by the nickname of Indy ('The Young Indiana Jones Chronicles'). Maybe they teamed up to put an end to this California cloning case.
I'm not saying this is what actually happened. It's just a "pozz'bility", but one which I'm throwing out there for the fanficcers.
And it was all inspired by Maudie Prickett.