MPR Met-Pro Corp.

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                          CUSIP Number: 590876306


                            December 31, 2013
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            (Date of Event which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

           |x| Rule 13d-1(b)

           | | Rule 13d-1(c)

           | | Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

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CUSIP No. 590876306

1.       NAME OF REPORTING PERSON(S)

            THE KILLEN GROUP, INC.

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            IRS#23-2213851

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
         (See Instructions)                       (a)  | |
                                                  (b)  | |

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION
           Incorporated in the Commonwealth of Pennsylvania

              5.        SOLE VOTING POWER
 NUMBER OF               0
   SHARES
BENEFICIALLY  6.        SHARED VOTING POWER
  OWNED BY
    EACH
 REPORTING    7.        SOLE DISPOSITIVE POWER
   PERSON                0
    WITH
              8.        SHARED DISPOSITIVE POWER


9.        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           0

10.       CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
          SHARES (See Instructions) ____________


11.       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
           0

12.       TYPE OF REPORTING PERSON (See Instructions)
           IA


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Item 1.  (a) Name of Issuer:

         The name of the issuer is MET-PRO CORPORATION

         (b) Address of Issuer's Principal Executive Offices:

         The Issuer's principal executive offices are located at
             160 Cassell Road, P.O. Box 144, Harleysville, Pennsylvania 19438



Item 2. (a) Name of Person Filing:

             THE KILLEN GROUP, INC.

        (b) Address of Principal Business Office, or if none, Residence:

             1189 LANCASTER AVE., BERWYN, PA 19312

        (c) Citizenship:

             THE KILLEN GROUP IS A CORPORATION INCORPORATED UNDER THE
             LAWS OF THE COMMONWEALTH OF PENNSYLVANIA

        (d) Title of Class of Securities:

              COMMON STOCK OF THE ISSUER.

        (e) CUSIP Number:

              590876306


Item 3.  THE KILLEN GROUP, INC. IS AN INVESTMENT ADVISOR REGISTERED UNDER
         SECTION 203 OF THE INVESTMENT ADVISOR ACT OF 1940.


Item 4.  Ownership.

(a) THE KILLEN GROUP, INC. IS THE BENEFICIAL OWNER OF 0
SHARES OF THE ISSUER'S COMMON STOCK.

         (b)   THE AMOUNT OWNED BY THE KILLEN GROUP IS 0% OF THE SHARES
               OUTSTANDING.

         (c)
            (i) THE KILLEN GROUP HAS THE SOLE POWER TO VOTE OR TO DIRECT
                 THE VOTE OF 0 SHARES OF COMMON STOCK.

            (ii) THE KILLEN GROUP HAS THE SOLE POWER TO VOTE OR TO DIRECT
                 THE DISPOSITION OF 0 SHARES OF COMMON STOCK.


Item 5.  Ownership of Five Percent or Less of a Class.

         If this statement is being filed to report the fact that as of
         the date hereof the reporting person has ceased to be the
         beneficial owner of more than five percent of the class of
         securities, check the following [X].

Item 6.  Ownership of More than Five Percent on Behalf of Another Person.

         Not applicable.

Item 7.  Identification and Classification of the Subsidiary Which
         Acquired the Security Being Reported on By the Parent Holding
         Company.

         Not applicable.


Item 8.  Identification and Classification of Members of the Group.

         Not applicable.


Item 9.  Notice of Dissolution of Group.

         Not applicable.


Item 10. Certification.

         Each of the Reporting Persons hereby makes the following
         certification:

         By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were not acquired and
         are not held for the purpose of or with the effect of changing
         or influencing the control of the issuer of the securities and
         were not acquired and are not held in connection with or as a
         participant in any transaction having that purpose or effect.


                                   SIGNATURE

         After reasonable inquiry and to the best of my knowledge and
         belief, I certify that the information set forth in this
         statement is true, complete and correct.

                                     Dated:  February 14, 2014

                                     THE KILLEN GROUP, INC.



                                     By:  ROBERT E. KILLEN
                                          ------------------------------
                                          Name:  Robert E. Killen
                                          Title: Chairman and CEO