Election watchdog worried over defective PCOS machines in Zamboanga

Glitches encountered in final testing of PCOS machines in Q.C.

COMELEC holds final testing and sealing of PCOS machines in CamSur

Final testing and sealing of PCOS machines underway

Glitches seen in PCOS machines' final tests

3 PCOS machines found in hotel room

More glitches reported in final testing of PCOS machines

Final testing and sealing of PCOS machines continue

More PCOS machines suffer glitches

Glitches continue to mar final testing and sealing of PCOS machines

COMELEC resumes final testing of PCOS machines

COMELEC resumes final testing of PCOS machines

Minor glitches mar final testing of PCOS machines in Masbate

Kontra Daya: Glitches in final testing of PCOS machines show Comelec has yet to address problems experienced in 2010 polls

Fewer PCOS machines failed in 2013: Brillantes

Comelec urged to junk Smartmatic PCOS machines

EXCLUSIVE: PCOS machines being considered for ARMM elections

Glitches seen in PCOS machines during test in Pasay

Tempers rise as QC voters suffer long lines, PCOS glitches

Vote buying reports, PCOS complaints pour in at PPCRV

PCOS testing in Tuguegarao City

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