Where did all the Security Guard and Alarm Companys in Pittsburgh Go ?

When I started as a guard in the 70's there where over 200 security guarding and alarm outfits in Pittsburgh some did both alarms and guards  or just alarms or just guards  95% of them gone either closed completely and assets sold  , bought and merged etc. many started by ex cops and detectives as retirement income . some outfits only had 2-4 guards  with 1 or 2 accounts while some like Burns had hundreds same with alarm company's.

? mark means the company name is no longer around and what happened to outfit is unknown  some merged but with who unknown  many are now part of Securitus.

Security Guard Outfits

Burns International Security 7# Parkway Center West   -Merged now Securitus
Globe Security - Merged- now Securitus
McGlenon detective Agency -  Penn Ave Wilkinsburg- Closed?
Dell Detective Agency -  Bloomfield- Closed?
CPP Security ( California Plant Protection ) - Merged  with Pinkertons  now Securitus
United Detective Agency  Saw Mill Run Blvd.- Closed -?
Pinkerton Security Agency- Merged now Securitus
Universal Security Services - Closed
Paragon Security -  ?
Pegasus Security -Zelinople -Closed
Ogden Security Patrol - Crafton ?
Allied Security - Library Rd Rt 88 - Merged now Allied/ Barton after founder Niel Holmes died
Whitehall Security -Closed ?
Federated Security -  Allegheny River Blvd. Oakmont -Closed ?
The Security Bureau -Penn Hills - closed ?
Gregg Security - Merged ?
Firm Security - Banksville road - Merged  Vector Security
Commonwealth Security -Mckeesport ?
Pa. Professional Security- ?
Task Force Security  - #7 Parkway Center  -?
US Security Associates -?

United Detective Agency - Sawmill Run Blvd. - ?

Alarm Companys

? indicates fate of company unknown name no longer active under that name may have merged other company's

  Holmes Protection- Pittsburgh branch went to Westec  in Pittsburgh now Vector Security  Rest of Holmes  went to ADT
Burns International Security  merged with Holmes
Night Owl Security- merged with holmes
Black Shield Security- merged with holmes
Pittsburgh Fire Alarm service - Merged with Holmes
AAA Alarm merged with Holmes  

Holmes sold to Vector
 
Crime Busters- Merged with SSA Security systems of America
Laurel Security Fayette county - merged with SSA
Amper Security- Merged SSA
Commonwealth Security merged several times now part ADT
Firm Security -Banksville Rd.-  Acquired by  Vector Security
Universal Alarm - merged with Firm now part Vector Security
Interlock- Merged with firm Now part Vector Security 
Check Mate Security- Bethel Park ?
King Security - Owner deceased ?
PM Security- Penn Hills- Merged Cat Burglar& Fire Alarm
Guard Duty/ Minatronics ?
Mastertech- Merged Guardian Protection Services
Fidelity Alarms- Merged to Honeywell Now part  Stanley Security Solutions
Pittsburgh Alarm Service ?
Honeywill Security- North Hills ?
North Allegheny Security- North Hills   Now State Alarm Services- now owned by SSA
Perimitector -Penn Hills ?
Belco Security - Penn Hills ?
Lease n Alarm - Acquired by  Westec now Vector Security
Pittsburgh Alarm Service  ?

JTK? Alarm oakmont ?

Richard Neise? Security alarms - Penn hills ?

Suburban Security North hills-retired ATC monitoring acquired accounts 

  cauley detective Agency & Alarms

United detective agency & Alarms