Oyama Kabu History

Time	Kabu Name	Holder	Heya	Ichimon	Owner
05.1912 (KA) - during 05.1938 (RC)	Oyama[8] Nikichi	M3 Omidori Nikichi	Takasago	None
during 05.1938 (OO) - after 01.1939 (OO)	Oyama	vacant			M3 Omidori Nikichi
after 01.1939 (KA) - after 05.1939 (KC)	Oyama[9] Seikichi	M4 Imizugawa Seikichi	Takasago	None	M3 Omidori Nikichi
after 05.1939 (KA) - 12.1939 (HB)	Oyama[10] Wataru	S Takanobori Wataru	Takasago	None
01.1940 (HB) - 19.01.1962 (PA)	Oyama[10] Wataru	S Takanobori Wataru	Oyama	Takasago
20.01.1962 (KC) - 21.04.1986 (PA)	Oyama[11] Shigeo	O Matsunobori Fukutaro	Oyama	Takasago
22.04.1986 (QQ) - 24.04.1986 (QQ)	Oyama	vacant	Oyama	Takasago	O Matsunobori Fukutaro
25.04.1986 (HT) - 06.1986 (HS)	Oyama[12] Susumu	M2 Onobori Susumu	Oyama	Takasago
07.1986 (HS) - 27.12.2011 (HCa)	Oyama[12] Susumu	M2 Onobori Susumu	Takasago	Takasago
28.12.2011 (HCa) -	Oyama[12] Susumu	M2 Onobori Susumu	Azumazeki	Takasago

HB	Heya branchout
HCa	Heya change (actively)
HS	Heya shutdown
HT	Heya takeover (new shisho picks up heya name)
KA	Kabu assumed
KC	Kabu changed
OO	Vacant
PA	Passed away
QQ	Vacant (headless heya)
RC	Retirement Close of business (earlier retirement)