for /f "tokens=1,*" %%i in (temp.txt) do (
if /i "%%i"=="Specification" set t=%%j
if /i "%%i"=="product" set m=%%j
if /i "%%i"=="Stock" set f=%%j
)
set t=%t:(TM)=%
set t=%t:(R)=%
set t=%t:)=%
set t=%t:(=#%
if "%t:@=%"=="%t%" if "%t:Hz=%"=="%t%" (
for /f "tokens=1,2,3" %%i in ("%f%") do set c=%%j %%k
set t=%t% @ %c%
)