These certificates during the 1930's had numbers preceded with various unexplained combinations of letters.
No. Date Certificate Granted Applicant Route
"CT" Certificates
1 Oct. 6, 1933 Madison Railways Madison
3 Oct. 17, 1933 Milwaukee Elec. Ry. & Lt. Co. Milwaukee
12 Dec. 12, 1933 Oshkosh City Lines Oshkosh
Acquired from Wisconsin Power & Light Co.
Sold 1962 to City Transit Lines
15 Feb. 14, 1934 Cherry Transit Co. Green Bay-Sturgeon Bay
Acquired from C. A. Destache
26 Mar. 22, 1934 Motor Bus Company Chippewa Falls-Eau Claire
27 Feb. 20, 1934 Wisconsin Public Service Corp. Wausau
Sale to Wausau Transit Lines granted Jan. 29, 1951
34 Mar. 21, 1934 Theodore M. Schacher Antigo-Wausau
Acquired from Mr. Bohnacker
56 Jul. 6, 1934 Lake Shore Bus Co. Ashland-Bayfield
"IS" Certificates
168 Northland Greyhound Lines Milwaukee-Appleton-Stevens Point
Discontinuance granted
220 Northland Greyhound Lines Stevens Point-Wausau
Discontinuance granted
331 Aug. 31, 1933 Northland Greyhound Lines Wausau-Ironwood MI
Discontinuance granted
341 Aug. 29, 1933 M. M. Liederbach Hudson-Fond Du Lac-IL state line
"OS" Certificates
266 Apr. 11, 1935 Chicago Burlington & Quincy RR Miner-Winona MN
No. Date Certificate Granted Applicant Route